fix modeltester attachment replay and add proxy file retention

src/server/config.ts

@@ -110,6 +110,8 @@ export function buildConfig(env: NodeJS.ProcessEnv) {
     tokenRouterCacheTtlMs: Math.max(100, Math.trunc(parseNumber(env.TOKEN_ROUTER_CACHE_TTL_MS, 1_500))),
     proxyLogRetentionDays: Math.max(0, Math.trunc(parseNumber(env.PROXY_LOG_RETENTION_DAYS, 30))),
     proxyLogRetentionPruneIntervalMinutes: Math.max(1, Math.trunc(parseNumber(env.PROXY_LOG_RETENTION_PRUNE_INTERVAL_MINUTES, 30))),
+    proxyFileRetentionDays: Math.max(0, Math.trunc(parseNumber(env.PROXY_FILE_RETENTION_DAYS, 30))),
+    proxyFileRetentionPruneIntervalMinutes: Math.max(1, Math.trunc(parseNumber(env.PROXY_FILE_RETENTION_PRUNE_INTERVAL_MINUTES, 60))),
     proxyErrorKeywords: parseCsvList(env.PROXY_ERROR_KEYWORDS),
     proxyEmptyContentFailEnabled: parseBoolean(env.PROXY_EMPTY_CONTENT_FAIL, false),
     codexHeaderDefaults: {

src/server/index.ts

@@ -23,6 +23,7 @@ import { siteAnnouncementsRoutes } from './routes/api/siteAnnouncements.js';
 import { proxyRoutes } from './routes/proxy/router.js';
 import { startScheduler } from './services/checkinScheduler.js';
 import { rebuildTokenRoutesFromAvailability } from './services/modelService.js';
+import { startProxyFileRetentionService, stopProxyFileRetentionService } from './services/proxyFileRetentionService.js';
 import { setLegacyProxyLogRetentionFallbackEnabled, stopProxyLogRetentionService } from './services/proxyLogRetentionService.js';
 import { buildStartupSummaryLines } from './services/startupInfo.js';
 import { repairStoredCreatedAtValues } from './services/storedTimestampRepairService.js';
@@ -406,7 +407,9 @@ try {
   console.warn(`Failed to start OAuth callback listeners: ${(error as Error)?.message || 'unknown error'}`);
 }
 setLegacyProxyLogRetentionFallbackEnabled(!config.logCleanupConfigured);
+startProxyFileRetentionService();
 app.addHook('onClose', async () => {
+  stopProxyFileRetentionService();
   stopProxyLogRetentionService();
   await stopOAuthLoopbackCallbackServers();
 });

src/server/services/proxyFileRetentionService.test.ts

@@ -0,0 +1,112 @@
+import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
+import { mkdtempSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+
+type DbModule = typeof import('../db/index.js');
+type StoreModule = typeof import('./proxyFileStore.js');
+type RetentionModule = typeof import('./proxyFileRetentionService.js');
+type ConfigModule = typeof import('../config.js');
+
+describe('proxyFileRetentionService', () => {
+  let db: DbModule['db'];
+  let schema: DbModule['schema'];
+  let store: StoreModule;
+  let retention: RetentionModule;
+  let config: ConfigModule['config'];
+  let dataDir = '';
+  let originalRetentionDays = 0;
+  let originalPruneIntervalMinutes = 0;
+
+  beforeAll(async () => {
+    dataDir = mkdtempSync(join(tmpdir(), 'metapi-proxy-file-retention-'));
+    process.env.DATA_DIR = dataDir;
+
+    await import('../db/migrate.js');
+    const dbModule = await import('../db/index.js');
+    const storeModule = await import('./proxyFileStore.js');
+    const retentionModule = await import('./proxyFileRetentionService.js');
+    const configModule = await import('../config.js');
+    db = dbModule.db;
+    schema = dbModule.schema;
+    store = storeModule;
+    retention = retentionModule;
+    config = configModule.config;
+    originalRetentionDays = config.proxyFileRetentionDays;
+    originalPruneIntervalMinutes = config.proxyFileRetentionPruneIntervalMinutes;
+  });
+
+  beforeEach(async () => {
+    config.proxyFileRetentionDays = originalRetentionDays;
+    config.proxyFileRetentionPruneIntervalMinutes = originalPruneIntervalMinutes;
+    await db.delete(schema.proxyFiles).run();
+  });
+
+  afterAll(async () => {
+    config.proxyFileRetentionDays = originalRetentionDays;
+    config.proxyFileRetentionPruneIntervalMinutes = originalPruneIntervalMinutes;
+    const dbModule = await import('../db/index.js');
+    await dbModule.closeDbConnections();
+    delete process.env.DATA_DIR;
+  });
+
+  it('returns disabled when proxy file retention is turned off', async () => {
+    config.proxyFileRetentionDays = 0;
+
+    const result = await retention.cleanupExpiredProxyFiles(Date.parse('2026-03-20T00:00:00Z'));
+
+    expect(result).toEqual({
+      enabled: false,
+      retentionDays: 0,
+      cutoffUtc: null,
+      deleted: 0,
+    });
+  });
+
+  it('purges files older than the configured retention window', async () => {
+    config.proxyFileRetentionDays = 7;
+
+    await db.insert(schema.proxyFiles).values([
+      {
+        publicId: 'file-metapi-old',
+        ownerType: 'global_proxy_token',
+        ownerId: 'global',
+        filename: 'old.txt',
+        mimeType: 'text/plain',
+        purpose: 'assistants',
+        byteSize: 3,
+        sha256: 'old-hash',
+        contentBase64: Buffer.from('old').toString('base64'),
+        createdAt: '2026-03-10 00:00:00',
+        updatedAt: '2026-03-10 00:00:00',
+        deletedAt: null,
+      },
+      {
+        publicId: 'file-metapi-new',
+        ownerType: 'global_proxy_token',
+        ownerId: 'global',
+        filename: 'new.txt',
+        mimeType: 'text/plain',
+        purpose: 'assistants',
+        byteSize: 3,
+        sha256: 'new-hash',
+        contentBase64: Buffer.from('new').toString('base64'),
+        createdAt: '2026-03-18 00:00:00',
+        updatedAt: '2026-03-18 00:00:00',
+        deletedAt: null,
+      },
+    ]).run();
+
+    const result = await retention.cleanupExpiredProxyFiles(Date.parse('2026-03-20T00:00:00Z'));
+
+    expect(result).toEqual({
+      enabled: true,
+      retentionDays: 7,
+      cutoffUtc: '2026-03-13 00:00:00',
+      deleted: 1,
+    });
+
+    const remaining = await store.listProxyFilesByOwner({ ownerType: 'global_proxy_token', ownerId: 'global' });
+    expect(remaining.map((item) => item.publicId)).toEqual(['file-metapi-new']);
+  });
+});

src/server/services/proxyFileRetentionService.ts

@@ -0,0 +1,63 @@
+import { config } from '../config.js';
+import { getLogCleanupCutoffUtc } from './logCleanupService.js';
+import { purgeExpiredProxyFiles } from './proxyFileStore.js';
+
+let retentionTimer: ReturnType<typeof setInterval> | null = null;
+
+export function getProxyFileRetentionCutoffUtc(nowMs = Date.now()): string | null {
+  const days = Math.max(0, Math.trunc(config.proxyFileRetentionDays));
+  if (days <= 0) return null;
+  return getLogCleanupCutoffUtc(days, nowMs);
+}
+
+export async function cleanupExpiredProxyFiles(nowMs = Date.now()): Promise<{
+  enabled: boolean;
+  retentionDays: number;
+  cutoffUtc: string | null;
+  deleted: number;
+}> {
+  const retentionDays = Math.max(0, Math.trunc(config.proxyFileRetentionDays));
+  const cutoffUtc = getProxyFileRetentionCutoffUtc(nowMs);
+  if (!cutoffUtc) {
+    return {
+      enabled: false,
+      retentionDays,
+      cutoffUtc: null,
+      deleted: 0,
+    };
+  }
+
+  const deleted = await purgeExpiredProxyFiles(cutoffUtc);
+  return {
+    enabled: true,
+    retentionDays,
+    cutoffUtc,
+    deleted,
+  };
+}
+
+export function startProxyFileRetentionService(): void {
+  if (retentionTimer) return;
+
+  const intervalMinutes = Math.max(1, Math.trunc(config.proxyFileRetentionPruneIntervalMinutes));
+  const intervalMs = intervalMinutes * 60 * 1000;
+  const runCleanup = async () => {
+    try {
+      const result = await cleanupExpiredProxyFiles();
+      if (!result.enabled || result.deleted <= 0) return;
+      console.info(`[proxy-file-retention] deleted ${result.deleted} files before ${result.cutoffUtc}`);
+    } catch (error) {
+      console.warn('[proxy-file-retention] cleanup failed', error);
+    }
+  };
+
+  void runCleanup();
+  retentionTimer = setInterval(() => { void runCleanup(); }, intervalMs);
+  retentionTimer.unref?.();
+}
+
+export function stopProxyFileRetentionService(): void {
+  if (!retentionTimer) return;
+  clearInterval(retentionTimer);
+  retentionTimer = null;
+}

src/server/services/proxyFileStore.test.ts

@@ -112,4 +112,45 @@ describe('proxyFileStore', () => {
     });
     expect(loaded).toBeNull();
   });
+
+  it('purges expired proxy files before a cutoff to control database growth', async () => {
+    await db.insert(schema.proxyFiles).values([
+      {
+        publicId: 'file-metapi-old',
+        ownerType: 'global_proxy_token',
+        ownerId: 'global',
+        filename: 'old.txt',
+        mimeType: 'text/plain',
+        purpose: 'assistants',
+        byteSize: 3,
+        sha256: 'old-hash',
+        contentBase64: Buffer.from('old').toString('base64'),
+        createdAt: '2026-03-01 00:00:00',
+        updatedAt: '2026-03-01 00:00:00',
+        deletedAt: null,
+      },
+      {
+        publicId: 'file-metapi-new',
+        ownerType: 'global_proxy_token',
+        ownerId: 'global',
+        filename: 'new.txt',
+        mimeType: 'text/plain',
+        purpose: 'assistants',
+        byteSize: 3,
+        sha256: 'new-hash',
+        contentBase64: Buffer.from('new').toString('base64'),
+        createdAt: '2026-03-19 00:00:00',
+        updatedAt: '2026-03-19 00:00:00',
+        deletedAt: null,
+      },
+    ]).run();
+
+    const purgeExpiredProxyFiles = (store as Record<string, any>).purgeExpiredProxyFiles;
+    const deleted = await purgeExpiredProxyFiles?.('2026-03-10 00:00:00');
+
+    expect(deleted).toBe(1);
+
+    const remainingRows = await db.select().from(schema.proxyFiles).all();
+    expect(remainingRows.map((row) => row.publicId)).toEqual(['file-metapi-new']);
+  });
 });

src/server/services/proxyFileStore.ts

@@ -1,4 +1,4 @@
-import { and, desc, eq, isNull, or } from 'drizzle-orm';
+import { and, desc, eq, isNull, lt, or } from 'drizzle-orm';
 import { createHash } from 'node:crypto';
 import { db, schema } from '../db/index.js';
 import type { ProxyResourceOwner } from '../middleware/auth.js';
@@ -204,3 +204,17 @@ export async function softDeleteProxyFile(publicId: string): Promise<boolean> {
     .run();
   return Number(result?.changes || 0) > 0;
 }
+
+export async function purgeExpiredProxyFiles(cutoffUtc: string): Promise<number> {
+  const normalizedCutoff = cutoffUtc.trim();
+  if (!normalizedCutoff) return 0;
+
+  const result = await db.delete(schema.proxyFiles)
+    .where(or(
+      lt(schema.proxyFiles.createdAt, normalizedCutoff),
+      and(isNull(schema.proxyFiles.createdAt), lt(schema.proxyFiles.updatedAt, normalizedCutoff)),
+    ))
+    .run();
+
+  return Number(result?.changes || 0);
+}

src/web/api.test.ts

@@ -97,4 +97,33 @@ describe('api proxy test timeout handling', () => {
     await vi.advanceTimersByTimeAsync(30_000);
     await expect(promise).resolves.toMatchObject({ message: '请求超时（30s）' });
   });
+
+  it('loads proxy file content as a data URL for replay hydration', async () => {
+    const fetchMock = vi.fn().mockResolvedValue(new Response(
+      new Blob([Buffer.from('PDF')], { type: 'application/pdf' }),
+      {
+        status: 200,
+        headers: {
+          'content-type': 'application/pdf',
+          'content-disposition': 'inline; filename="brief.pdf"',
+        },
+      },
+    ));
+    vi.stubGlobal('fetch', fetchMock);
+
+    const getProxyFileContentDataUrl = (api as Record<string, any>).getProxyFileContentDataUrl;
+    const result = await getProxyFileContentDataUrl?.('file-metapi-123');
+
+    expect(fetchMock).toHaveBeenCalledWith('/v1/files/file-metapi-123/content', expect.objectContaining({
+      method: 'GET',
+      headers: expect.objectContaining({
+        Authorization: 'Bearer token-1',
+      }),
+    }));
+    expect(result).toEqual({
+      filename: 'brief.pdf',
+      mimeType: 'application/pdf',
+      data: 'data:application/pdf;base64,UERG',
+    });
+  });
 });

src/web/api.ts

@@ -4,6 +4,73 @@ type RequestOptions = RequestInit & {
   timeoutMs?: number;
 };
 
+function requireAuthToken(): string {
+  const token = getAuthToken(localStorage);
+  if (!token) {
+    const hadToken = !!localStorage.getItem('auth_token');
+    clearAuthSession(localStorage);
+    if (hadToken && typeof window !== 'undefined' && typeof window.location?.reload === 'function') {
+      window.location.reload();
+    }
+    throw new Error('Session expired');
+  }
+  return token;
+}
+
+async function extractResponseErrorMessage(res: Response): Promise<string> {
+  let message = `HTTP ${res.status}`;
+  try {
+    const text = await res.text();
+    if (text) {
+      try {
+        const json = JSON.parse(text);
+        if (json?.message && typeof json.message === 'string') {
+          message = json.message;
+        } else if (json?.error && typeof json.error === 'string') {
+          message = json.error;
+        } else if (json?.error?.message && typeof json.error.message === 'string') {
+          message = json.error.message;
+        } else {
+          message = `${message}: ${text.slice(0, 120)}`;
+        }
+      } catch {
+        message = `${message}: ${text.slice(0, 120)}`;
+      }
+    }
+  } catch { }
+  return message;
+}
+
+function parseContentDispositionFilename(headerValue: string | null): string | null {
+  if (!headerValue) return null;
+  const utf8Match = /filename\*=UTF-8''([^;]+)/i.exec(headerValue);
+  if (utf8Match?.[1]) {
+    try {
+      return decodeURIComponent(utf8Match[1]);
+    } catch {
+      return utf8Match[1];
+    }
+  }
+  const quotedMatch = /filename="([^"]+)"/i.exec(headerValue);
+  if (quotedMatch?.[1]) return quotedMatch[1];
+  const bareMatch = /filename=([^;]+)/i.exec(headerValue);
+  return bareMatch?.[1]?.trim() || null;
+}
+
+function arrayBufferToBase64(buffer: ArrayBuffer): string {
+  if (typeof Buffer !== 'undefined') {
+    return Buffer.from(buffer).toString('base64');
+  }
+
+  let binary = '';
+  const bytes = new Uint8Array(buffer);
+  const chunkSize = 0x8000;
+  for (let index = 0; index < bytes.length; index += chunkSize) {
+    binary += String.fromCharCode(...bytes.subarray(index, index + chunkSize));
+  }
+  return btoa(binary);
+}
+
 async function request(url: string, options: RequestOptions = {}) {
   const { timeoutMs = 30_000, signal: externalSignal, ...fetchOptions } = options;
   const controller = new AbortController();
@@ -22,15 +89,7 @@ async function request(url: string, options: RequestOptions = {}) {
     }
   }
 
-  const token = getAuthToken(localStorage);
-  if (!token) {
-    const hadToken = !!localStorage.getItem('auth_token');
-    clearAuthSession(localStorage);
-    if (hadToken && typeof window !== 'undefined' && typeof window.location?.reload === 'function') {
-      window.location.reload();
-    }
-    throw new Error('Session expired');
-  }
+  const token = requireAuthToken();
   const headers: Record<string, string> = {
     'Authorization': `Bearer ${token}`,
   };
@@ -52,25 +111,7 @@ async function request(url: string, options: RequestOptions = {}) {
       throw new Error('Session expired');
     }
     if (!res.ok) {
-      let message = `HTTP ${res.status}`;
-      try {
-        const text = await res.text();
-        if (text) {
-          try {
-            const json = JSON.parse(text);
-            if (json?.message && typeof json.message === 'string') {
-              message = json.message;
-            } else if (json?.error && typeof json.error === 'string') {
-              message = json.error;
-            } else {
-              message = `${message}: ${text.slice(0, 120)}`;
-            }
-          } catch {
-            message = `${message}: ${text.slice(0, 120)}`;
-          }
-        }
-      } catch { }
-      throw new Error(message);
+      throw new Error(await extractResponseErrorMessage(res));
     }
     return res.json();
   } catch (error: any) {
@@ -623,6 +664,37 @@ export const api = {
     }),
   getProxyTestJob: (jobId: string) => request(`/api/test/proxy/jobs/${encodeURIComponent(jobId)}`),
   deleteProxyTestJob: (jobId: string) => request(`/api/test/proxy/jobs/${encodeURIComponent(jobId)}`, { method: 'DELETE' }),
+  getProxyFileContentDataUrl: async (fileId: string) => {
+    const token = requireAuthToken();
+    const response = await fetch(`/v1/files/${encodeURIComponent(fileId)}/content`, {
+      method: 'GET',
+      headers: {
+        Authorization: `Bearer ${token}`,
+      },
+    });
+    if (response.status === 401 || response.status === 403) {
+      const hadToken = !!getAuthToken(localStorage);
+      clearAuthSession(localStorage);
+      if (hadToken && typeof window !== 'undefined' && typeof window.location?.reload === 'function') {
+        window.location.reload();
+      }
+      throw new Error('Session expired');
+    }
+    if (!response.ok) {
+      throw new Error(await extractResponseErrorMessage(response));
+    }
+
+    const mimeType = (response.headers.get('content-type') || 'application/octet-stream')
+      .split(';')[0]
+      .trim() || 'application/octet-stream';
+    const filename = parseContentDispositionFilename(response.headers.get('content-disposition'));
+    const base64 = arrayBufferToBase64(await response.arrayBuffer());
+    return {
+      filename,
+      mimeType,
+      data: `data:${mimeType};base64,${base64}`,
+    };
+  },
   testProxy: (data: ProxyTestRequestEnvelope) =>
     request('/api/test/proxy', {
       method: 'POST',

src/web/pages/ModelTester.tsx

@@ -30,10 +30,12 @@ import {
   parseCustomRequestBody,
   parseModelTesterSession,
   processThinkTags,
+  resolveConversationReplayFiles,
   serializeModelTesterSession,
   syncCustomRequestBodyToMessages,
   syncMessagesToCustomRequestBody,
   type ChatMessage,
+  type ConversationDraftFile,
   type ConversationContentPart,
   type ConversationUploadedFile,
   type DebugTab,
@@ -74,12 +76,7 @@ type UploadState = {
   dataUrl: string;
 };
 
-type ConversationFileState = UploadState & {
-  localId: string;
-  fileId?: string | null;
-  status: 'pending' | 'uploading' | 'uploaded' | 'error';
-  errorMessage?: string | null;
-};
+type ConversationFileState = ConversationDraftFile;
 
 const POLL_INTERVAL_MS = 1200;
 const wait = (ms: number) => new Promise<void>((resolve) => setTimeout(resolve, ms));
@@ -767,6 +764,7 @@ export default function ModelTester() {
     setAssetPrompt(restored.modeState.imagesPrompt || restored.modeState.videosPrompt);
     setVideoInspectId(restored.modeState.videosInspectId);
     setVideoInspectAction(restored.inputs.videoInspectAction === 'delete' ? 'DELETE' : 'GET');
+    setConversationFiles(restored.conversationFiles);
 
     if (restored.pendingJobId) {
       setSending(true);
@@ -827,6 +825,7 @@ export default function ModelTester() {
       inputs,
       parameterEnabled,
       messages,
+      conversationFiles,
       modeState: {
         embeddingsInput: embeddingInputText,
         searchQuery: searchQueryValue,
@@ -852,6 +851,7 @@ export default function ModelTester() {
     input,
     inputs,
     messages,
+    conversationFiles,
     assetPrompt,
     customRequestBody,
     embeddingInputText,
@@ -1014,6 +1014,19 @@ export default function ModelTester() {
     return false;
   }, [conversationFileCapability, conversationFileHint, pushDebug]);
 
+  const loadLocalConversationFile = useCallback(async (fileId: string) => {
+    const resolved = await api.getProxyFileContentDataUrl(fileId) as {
+      filename?: string | null;
+      mimeType?: string | null;
+      data: string;
+    };
+    return {
+      filename: resolved.filename || null,
+      mimeType: resolved.mimeType || null,
+      data: resolved.data,
+    };
+  }, []);
+
   const buildConversationMessagesWithSystem = useCallback((baseMessages: ChatMessage[]) => {
     if (!inputs.systemPrompt.trim()) return baseMessages;
     return [
@@ -1805,10 +1818,19 @@ export default function ModelTester() {
     baseMessages: ChatMessage[],
     files: ConversationUploadedFile[] = [],
   ) => {
-    if (!ensureSupportedConversationFiles(files)) {
+    let resolvedFiles = files;
+    try {
+      resolvedFiles = await resolveConversationReplayFiles(files, inputs.protocol, loadLocalConversationFile);
+    } catch (resolveError: any) {
+      const message = resolveError?.message || '读取会话附件失败';
+      setError(message);
+      pushDebug('error', message);
       return;
     }
-    const userMessage = createConversationUserMessage(prompt, files);
+    if (!ensureSupportedConversationFiles(resolvedFiles)) {
+      return;
+    }
+    const userMessage = createConversationUserMessage(prompt, resolvedFiles);
     const loadingAssistant = createLoadingAssistantMessage();
     const nextMessages = [...baseMessages, userMessage, loadingAssistant];
     const useProxyTransport = inputs.protocol === 'gemini' || customRequestMode;
@@ -1826,7 +1848,7 @@ export default function ModelTester() {
     }
 
     await dispatchPayload(nextMessages, payload, { syncedCustomBody });
-  }, [buildConversationProxyEnvelope, buildPayloadWithMessages, createConversationUserMessage, customRequestMode, dispatchPayload, dispatchProxyEnvelope, ensureSupportedConversationFiles, inputs.protocol, pushDebug]);
+  }, [buildConversationProxyEnvelope, buildPayloadWithMessages, createConversationUserMessage, customRequestMode, dispatchPayload, dispatchProxyEnvelope, ensureSupportedConversationFiles, inputs.protocol, loadLocalConversationFile, pushDebug]);
 
   const sendModeRequest = useCallback(async () => {
     const envelope = buildModeProxyEnvelope();

src/web/pages/helpers/modelTesterSession.test.ts

@@ -1,4 +1,5 @@
-import { describe, expect, it } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
+import * as modelTesterSessionModule from './modelTesterSession.js';
 import {
   DEBUG_TABS,
   DEFAULT_INPUTS,
@@ -80,6 +81,17 @@ describe('modelTesterSession', () => {
       customRequestBody: '{"model":"gemini-2.5-pro","contents":[]}',
       showDebugPanel: true,
       activeDebugTab: DEBUG_TABS.REQUEST,
+      conversationFiles: [
+        {
+          localId: 'draft-file-1',
+          name: 'draft.pdf',
+          mimeType: 'application/pdf',
+          dataUrl: 'data:application/pdf;base64,JVBERi0x',
+          fileId: 'file-metapi-draft',
+          status: 'uploaded',
+          errorMessage: null,
+        },
+      ],
       modeState: {
         ...DEFAULT_MODE_STATE,
         searchQuery: 'hello',
@@ -273,6 +285,37 @@ describe('modelTesterSession', () => {
     ]);
   });
 
+  it('hydrates local file ids into inline replay files for claude', async () => {
+    const resolveConversationReplayFiles = (modelTesterSessionModule as Record<string, any>).resolveConversationReplayFiles;
+    const loader = vi.fn(async () => ({
+      filename: 'brief.pdf',
+      mimeType: 'application/pdf',
+      data: 'data:application/pdf;base64,JVBERi0x',
+    }));
+
+    const files = await resolveConversationReplayFiles?.(
+      [
+        {
+          fileId: 'file-metapi-123',
+          filename: 'brief.pdf',
+          mimeType: 'application/pdf',
+        },
+      ],
+      'claude',
+      loader,
+    );
+
+    expect(loader).toHaveBeenCalledWith('file-metapi-123');
+    expect(files).toEqual([
+      {
+        fileId: 'file-metapi-123',
+        filename: 'brief.pdf',
+        mimeType: 'application/pdf',
+        data: 'data:application/pdf;base64,JVBERi0x',
+      },
+    ]);
+  });
+
   it('preserves file reference parts when building responses conversation payloads', () => {
     const payload = buildApiPayload(
       [{
@@ -486,6 +529,136 @@ describe('modelTesterSession', () => {
     });
   });
 
+  it('prefers native file ids over inline backups for OpenAI and Responses payloads', () => {
+    const message = {
+      id: 'u1',
+      role: 'user' as const,
+      content: 'reuse native file id',
+      createAt: 1,
+      parts: [
+        {
+          type: 'input_file' as const,
+          fileId: 'file-metapi-123',
+          filename: 'brief.pdf',
+          mimeType: 'application/pdf',
+          data: 'data:application/pdf;base64,JVBERi0x',
+        },
+      ],
+    };
+
+    const openAiPayload = buildApiPayload(
+      [message],
+      {
+        ...DEFAULT_INPUTS,
+        model: 'gpt-4.1',
+        protocol: 'openai',
+      },
+      DEFAULT_PARAMETER_ENABLED,
+    );
+
+    expect(openAiPayload.jsonBody).toEqual({
+      model: 'gpt-4.1',
+      messages: [
+        {
+          role: 'user',
+          content: [
+            { type: 'text', text: 'reuse native file id' },
+            {
+              type: 'file',
+              file: {
+                file_id: 'file-metapi-123',
+                filename: 'brief.pdf',
+                mime_type: 'application/pdf',
+              },
+            },
+          ],
+        },
+      ],
+      stream: false,
+      temperature: 0.7,
+      frequency_penalty: 0,
+      presence_penalty: 0,
+    });
+
+    const responsesPayload = buildApiPayload(
+      [message],
+      {
+        ...DEFAULT_INPUTS,
+        model: 'gpt-4.1',
+        protocol: 'responses',
+      },
+      DEFAULT_PARAMETER_ENABLED,
+    );
+
+    expect(responsesPayload.jsonBody).toEqual({
+      model: 'gpt-4.1',
+      input: [
+        {
+          role: 'user',
+          content: [
+            { type: 'input_text', text: 'reuse native file id' },
+            {
+              type: 'input_file',
+              file_id: 'file-metapi-123',
+              filename: 'brief.pdf',
+            },
+          ],
+        },
+      ],
+      stream: false,
+      temperature: 0.7,
+    });
+  });
+
+  it('strips data URL wrappers when replaying inline files into OpenAI chat payloads', () => {
+    const payload = buildApiPayload(
+      [{
+        id: 'u1',
+        role: 'user',
+        content: 'summarize this inline file',
+        createAt: 1,
+        parts: [
+          {
+            type: 'input_file',
+            filename: 'brief.pdf',
+            mimeType: 'application/pdf',
+            data: 'data:application/pdf;base64,JVBERi0x',
+          },
+        ],
+      } as ChatMessage],
+      {
+        ...DEFAULT_INPUTS,
+        model: 'gpt-4.1',
+        protocol: 'openai',
+      },
+      DEFAULT_PARAMETER_ENABLED,
+    );
+
+    expect(payload.jsonBody).toEqual({
+      model: 'gpt-4.1',
+      messages: [
+        {
+          role: 'user',
+          content: [
+            { type: 'text', text: 'summarize this inline file' },
+            {
+              type: 'file',
+              file: {
+                file_data: 'JVBERi0x',
+                filename: 'brief.pdf',
+                mime_type: 'application/pdf',
+              },
+            },
+          ],
+        },
+      ],
+      stream: false,
+      temperature: 0.7,
+      frequency_penalty: 0,
+      presence_penalty: 0,
+    });
+  });
+
   it('builds Claude conversation payloads with inline document blocks for conversation files', () => {
     const payload = buildApiPayload(
       [{

src/web/pages/helpers/modelTesterSession.ts

@@ -76,6 +76,16 @@ export type ConversationUploadedFile = {
   data?: string | null;
 };
 
+export type ConversationDraftFile = {
+  localId: string;
+  name: string;
+  mimeType: string;
+  dataUrl: string;
+  fileId?: string | null;
+  status: 'pending' | 'uploading' | 'uploaded' | 'error';
+  errorMessage?: string | null;
+};
+
 export type TesterProxyEnvelope = {
   method: ProxyRequestMethod;
   path: string;
@@ -133,6 +143,7 @@ export type ModelTesterSessionState = {
   inputs: ModelTesterInputs;
   parameterEnabled: ParameterEnabled;
   messages: ChatMessage[];
+  conversationFiles: ConversationDraftFile[];
   pendingPayload: TesterProxyEnvelope | null;
   pendingJobId?: string | null;
   customRequestMode: boolean;
@@ -200,8 +211,10 @@ const VALID_MODES: ReadonlySet<string> = new Set([
   'videos.inspect',
 ]);
 const VALID_PROTOCOLS: ReadonlySet<string> = new Set(['openai', 'responses', 'claude', 'gemini']);
+const VALID_CONVERSATION_DRAFT_STATUSES: ReadonlySet<string> = new Set(['pending', 'uploading', 'uploaded', 'error']);
 const VALID_PROXY_METHODS: ReadonlySet<string> = new Set(['POST', 'GET', 'DELETE']);
 const VALID_REQUEST_KINDS: ReadonlySet<string> = new Set(['json', 'multipart', 'empty']);
+const LOCAL_PROXY_FILE_ID_PREFIX = 'file-metapi-';
 
 let messageCounter = 0;
 
@@ -296,10 +309,20 @@ const toOpenAiContentPart = (part: ConversationContentPart): Record<string, unkn
 
   if (part.type === 'input_file') {
     const filePayload: Record<string, unknown> = {};
-    if (typeof part.data === 'string' && part.data.trim()) filePayload.file_data = part.data.trim();
-    else if (typeof part.fileId === 'string' && part.fileId.trim()) filePayload.file_id = part.fileId.trim();
+    const fileId = typeof part.fileId === 'string' && part.fileId.trim()
+      ? part.fileId.trim()
+      : '';
+    const rawData = typeof part.data === 'string' && part.data.trim()
+      ? part.data.trim()
+      : '';
+    const parsed = rawData
+      ? parseDataUrl(rawData)
+      : null;
+    if (fileId) filePayload.file_id = fileId;
+    else if (rawData) filePayload.file_data = parsed?.data || rawData;
     if (typeof part.filename === 'string' && part.filename.trim()) filePayload.filename = part.filename.trim();
     if (typeof part.mimeType === 'string' && part.mimeType.trim()) filePayload.mime_type = part.mimeType.trim();
+    else if (parsed?.mimeType) filePayload.mime_type = parsed.mimeType;
     if (Object.keys(filePayload).length === 0) return null;
     return {
       type: 'file',
@@ -341,8 +364,8 @@ const toResponsesContentPart = (part: ConversationContentPart): Record<string, u
     const fileBlock: Record<string, unknown> = {
       type: 'input_file',
     };
-    if (typeof part.data === 'string' && part.data.trim()) fileBlock.file_data = part.data.trim();
-    else if (typeof part.fileId === 'string' && part.fileId.trim()) fileBlock.file_id = part.fileId.trim();
+    if (typeof part.fileId === 'string' && part.fileId.trim()) fileBlock.file_id = part.fileId.trim();
+    else if (typeof part.data === 'string' && part.data.trim()) fileBlock.file_data = part.data.trim();
     if (typeof part.filename === 'string' && part.filename.trim()) fileBlock.filename = part.filename.trim();
     if (Object.keys(fileBlock).length === 1) return null;
     return fileBlock;
@@ -702,6 +725,42 @@ const parseParameterEnabled = (value: unknown): ParameterEnabled => {
   };
 };
 
+const parseConversationDraftFiles = (value: unknown): ConversationDraftFile[] => {
+  if (!Array.isArray(value)) return [];
+  return value.flatMap((item, index) => {
+    if (!isRecord(item)) return [];
+    const localId = typeof item.localId === 'string' && item.localId.trim()
+      ? item.localId.trim()
+      : `draft-file-restored-${index}`;
+    const name = typeof item.name === 'string' && item.name.trim()
+      ? item.name.trim()
+      : 'upload.bin';
+    const mimeType = typeof item.mimeType === 'string' && item.mimeType.trim()
+      ? item.mimeType.trim()
+      : 'application/octet-stream';
+    const dataUrl = typeof item.dataUrl === 'string' && item.dataUrl.trim()
+      ? item.dataUrl.trim()
+      : '';
+    if (!dataUrl) return [];
+
+    return [{
+      localId,
+      name,
+      mimeType,
+      dataUrl,
+      ...(typeof item.fileId === 'string' && item.fileId.trim()
+        ? { fileId: item.fileId.trim() }
+        : {}),
+      status: typeof item.status === 'string' && VALID_CONVERSATION_DRAFT_STATUSES.has(item.status)
+        ? item.status as ConversationDraftFile['status']
+        : 'pending',
+      errorMessage: typeof item.errorMessage === 'string'
+        ? item.errorMessage
+        : null,
+    }];
+  });
+};
+
 const parseModeState = (value: unknown): ModelTesterModeState => {
   if (!isRecord(value)) return { ...DEFAULT_MODE_STATE };
   return {
@@ -943,6 +1002,48 @@ export const extractConversationUploadedFilesFromMessage = (
   });
 };
 
+export async function resolveConversationReplayFiles(
+  files: ConversationUploadedFile[],
+  protocol: PlaygroundProtocol,
+  loadLocalFile: (fileId: string) => Promise<{ filename?: string | null; mimeType?: string | null; data: string }>,
+): Promise<ConversationUploadedFile[]> {
+  if (protocol !== 'claude' && protocol !== 'gemini') {
+    return files.map((file) => ({ ...file }));
+  }
+
+  return Promise.all(files.map(async (file) => {
+    const fileId = typeof file.fileId === 'string' && file.fileId.trim()
+      ? file.fileId.trim()
+      : '';
+    const data = typeof file.data === 'string' && file.data.trim()
+      ? file.data.trim()
+      : '';
+    if (!fileId || data) {
+      return { ...file };
+    }
+    if (!fileId.startsWith(LOCAL_PROXY_FILE_ID_PREFIX)) {
+      throw new Error(`会话附件 ${fileId} 只有 file_id，当前协议需要可重放的内联数据。`);
+    }
+
+    const resolved = await loadLocalFile(fileId);
+    const resolvedData = typeof resolved?.data === 'string' ? resolved.data.trim() : '';
+    if (!resolvedData) {
+      throw new Error(`会话附件 ${fileId} 缺少可重放的数据。`);
+    }
+
+    return {
+      ...file,
+      ...(typeof resolved?.filename === 'string' && resolved.filename.trim()
+        ? { filename: resolved.filename.trim() }
+        : {}),
+      ...(typeof resolved?.mimeType === 'string' && resolved.mimeType.trim()
+        ? { mimeType: resolved.mimeType.trim() }
+        : {}),
+      data: resolvedData,
+    };
+  }));
+}
+
 export const createLoadingAssistantMessage = (): ChatMessage =>
   createMessage('assistant', '', {
     status: MESSAGE_STATUS.LOADING,
@@ -1047,6 +1148,7 @@ export const parseModelTesterSession = (raw: string | null): ModelTesterSessionS
     inputs,
     parameterEnabled,
     messages: sanitizeMessages(parsed.messages),
+    conversationFiles: parseConversationDraftFiles(parsed.conversationFiles),
     pendingPayload: parsePendingPayload(parsed.pendingPayload, inputs, parameterEnabled),
     customRequestMode: toBoolean(parsed.customRequestMode, false),
     customRequestBody: typeof parsed.customRequestBody === 'string' ? parsed.customRequestBody : '',