diff --git a/document/content/docs/upgrading/4-14/4144.mdx b/document/content/docs/upgrading/4-14/4144.mdx
index b33db70cf..a131f498d 100644
--- a/document/content/docs/upgrading/4-14/4144.mdx
+++ b/document/content/docs/upgrading/4-14/4144.mdx
@@ -31,6 +31,7 @@ curl --location --request POST 'https://{{host}}/api/admin/initv4144' \
 5. 新版订阅套餐逻辑。
 6. 支持配置对话文件白名单。
 7. S3 支持 pathStyle 配置。
+8. 支持通过 Sealos 来进行多租户自定义域名配置。
 
 ## ⚙️ 优化
 
diff --git a/document/data/doc-last-modified.json b/document/data/doc-last-modified.json
index 16a9e93d2..86afd48fd 100644
--- a/document/data/doc-last-modified.json
+++ b/document/data/doc-last-modified.json
@@ -199,6 +199,6 @@
   "document/content/docs/use-cases/external-integration/feishu.mdx": "2025-07-24T14:23:04+08:00",
   "document/content/docs/use-cases/external-integration/official_account.mdx": "2025-08-05T23:20:39+08:00",
   "document/content/docs/use-cases/external-integration/openapi.mdx": "2025-09-29T11:34:11+08:00",
-  "document/content/docs/use-cases/external-integration/wecom.mdx": "2025-12-09T18:14:22+08:00",
+  "document/content/docs/use-cases/external-integration/wecom.mdx": "2025-12-09T20:03:29+08:00",
   "document/content/docs/use-cases/index.mdx": "2025-07-24T14:23:04+08:00"
 }
\ No newline at end of file
diff --git a/packages/global/common/file/tools.ts b/packages/global/common/file/tools.ts
index ca31c2c50..7f2cb981e 100644
--- a/packages/global/common/file/tools.ts
+++ b/packages/global/common/file/tools.ts
@@ -1,5 +1,5 @@
 import { detect } from 'jschardet';
-import { documentFileType } from './constants';
+import { imageFileType } from './constants';
 import { ChatFileTypeEnum } from '../../core/chat/constants';
 import { type UserChatItemFileItemType } from '../../core/chat/type';
 import * as fs from 'fs';
@@ -66,18 +66,17 @@ export const parseUrlToFileType = (url: string): UserChatItemFileItemType | unde
     })();
     const extension = filename?.split('.').pop()?.toLowerCase() || '';
 
-    // If it's a document type, return as file, otherwise treat as image
-    if (extension && documentFileType.includes(extension)) {
+    if (extension && imageFileType.includes(extension)) {
+      // Default to file type for non-extension files
       return {
-        type: ChatFileTypeEnum.file,
+        type: ChatFileTypeEnum.image,
         name: filename || 'null',
         url
       };
     }
-
-    // Default to file type for non-extension files
+    // If it's a document type, return as file, otherwise treat as image
     return {
-      type: ChatFileTypeEnum.image,
+      type: ChatFileTypeEnum.file,
       name: filename || 'null',
       url
     };
diff --git a/packages/service/common/s3/buckets/base.ts b/packages/service/common/s3/buckets/base.ts
index 3242e3a70..ddebe451c 100644
--- a/packages/service/common/s3/buckets/base.ts
+++ b/packages/service/common/s3/buckets/base.ts
@@ -62,7 +62,9 @@ export class S3BaseBucket {
       await this.options.afterInit?.();
       console.log(`S3 init success: ${this.name}`);
     };
-    init();
+    if (this.options.init) {
+      init();
+    }
   }
 
   get name(): string {
diff --git a/packages/service/common/s3/constants.ts b/packages/service/common/s3/constants.ts
index 7b9b7c5bd..65be2f896 100644
--- a/packages/service/common/s3/constants.ts
+++ b/packages/service/common/s3/constants.ts
@@ -28,6 +28,7 @@ export const Mimes = {
 export const defaultS3Options: {
   externalBaseURL?: string;
   afterInit?: () => Promise<void> | void;
+  init?: boolean;
 } & ClientOptions = {
   useSSL: process.env.S3_USE_SSL === 'true',
   endPoint: process.env.S3_ENDPOINT || 'localhost',
diff --git a/packages/service/common/s3/index.ts b/packages/service/common/s3/index.ts
index 6e6729efd..012d31bf3 100644
--- a/packages/service/common/s3/index.ts
+++ b/packages/service/common/s3/index.ts
@@ -4,8 +4,8 @@ import { addLog } from '../system/log';
 import { startS3DelWorker } from './mq';
 
 export function initS3Buckets() {
-  const publicBucket = new S3PublicBucket();
-  const privateBucket = new S3PrivateBucket();
+  const publicBucket = new S3PublicBucket({ init: true });
+  const privateBucket = new S3PrivateBucket({ init: true });
 
   global.s3BucketMap = {
     [publicBucket.name]: publicBucket,
diff --git a/packages/service/common/s3/sources/avatar.ts b/packages/service/common/s3/sources/avatar.ts
index bfa179e32..6661d504e 100644
--- a/packages/service/common/s3/sources/avatar.ts
+++ b/packages/service/common/s3/sources/avatar.ts
@@ -7,16 +7,11 @@ import { getFileS3Key } from '../utils';
 
 class S3AvatarSource {
   private bucket: S3PublicBucket;
-  private static instance: S3AvatarSource;
 
   constructor() {
     this.bucket = new S3PublicBucket();
   }
 
-  static getInstance() {
-    return (this.instance ??= new S3AvatarSource());
-  }
-
   get prefix(): string {
     return imageBaseUrl;
   }
@@ -89,5 +84,13 @@ class S3AvatarSource {
 }
 
 export function getS3AvatarSource() {
-  return S3AvatarSource.getInstance();
+  if (global.avatarBucket) {
+    return global.avatarBucket;
+  }
+  global.avatarBucket = new S3AvatarSource();
+  return global.avatarBucket;
+}
+
+declare global {
+  var avatarBucket: S3AvatarSource;
 }
diff --git a/packages/service/common/s3/sources/chat/index.ts b/packages/service/common/s3/sources/chat/index.ts
index 5c86bad86..22463baf2 100644
--- a/packages/service/common/s3/sources/chat/index.ts
+++ b/packages/service/common/s3/sources/chat/index.ts
@@ -16,16 +16,11 @@ import { getFileS3Key } from '../../utils';
 
 export class S3ChatSource {
   private bucket: S3PrivateBucket;
-  private static instance: S3ChatSource;
 
   constructor() {
     this.bucket = new S3PrivateBucket();
   }
 
-  static getInstance() {
-    return (this.instance ??= new S3ChatSource());
-  }
-
   static parseChatUrl(url: string | URL) {
     try {
       const parseUrl = new URL(url);
@@ -131,5 +126,13 @@ export class S3ChatSource {
 }
 
 export function getS3ChatSource() {
-  return S3ChatSource.getInstance();
+  if (global.chatBucket) {
+    return global.chatBucket;
+  }
+  global.chatBucket = new S3ChatSource();
+  return global.chatBucket;
+}
+
+declare global {
+  var chatBucket: S3ChatSource;
 }
diff --git a/packages/service/common/s3/sources/dataset/index.ts b/packages/service/common/s3/sources/dataset/index.ts
index e8367b769..2acd2cd7e 100644
--- a/packages/service/common/s3/sources/dataset/index.ts
+++ b/packages/service/common/s3/sources/dataset/index.ts
@@ -29,16 +29,11 @@ import { S3Error } from 'minio';
 
 export class S3DatasetSource {
   public bucket: S3PrivateBucket;
-  private static instance: S3DatasetSource;
 
   constructor() {
     this.bucket = new S3PrivateBucket();
   }
 
-  static getInstance() {
-    return (this.instance ??= new S3DatasetSource());
-  }
-
   // 下载链接
   async createGetDatasetFileURL(params: CreateGetDatasetFileURLParams) {
     const { key, expiredHours, external } = CreateGetDatasetFileURLParamsSchema.parse(params);
@@ -260,5 +255,13 @@ export class S3DatasetSource {
 }
 
 export function getS3DatasetSource() {
-  return S3DatasetSource.getInstance();
+  if (global.datasetBucket) {
+    return global.datasetBucket;
+  }
+  global.datasetBucket = new S3DatasetSource();
+  return global.datasetBucket;
+}
+
+declare global {
+  var datasetBucket: S3DatasetSource;
 }
diff --git a/packages/service/core/workflow/dispatch/tools/readFiles.ts b/packages/service/core/workflow/dispatch/tools/readFiles.ts
index 62f79911d..565d27a94 100644
--- a/packages/service/core/workflow/dispatch/tools/readFiles.ts
+++ b/packages/service/core/workflow/dispatch/tools/readFiles.ts
@@ -207,23 +207,18 @@ export const getFileContentFromLinks = async ({
 
           // Get file name
           const { filename, extension, imageParsePrefix } = (() => {
-            const contentDisposition = response.headers['content-disposition'];
-            if (contentDisposition) {
+            if (isChatExternalUrl) {
+              const contentDisposition = response.headers['content-disposition'] || '';
               const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
               const matches = filenameRegex.exec(contentDisposition);
-              if (matches != null && matches[1]) {
-                const filename = decodeURIComponent(matches[1].replace(/['"]/g, ''));
-                return {
-                  filename,
-                  extension: path.extname(filename).replace('.', ''),
-                  imageParsePrefix: `` // TODO: 需要根据是否是聊天对话里面的外部链接来决定
-                };
-              }
-            }
+              const matchFilename =
+                matches != null && matches[1] ? matches[1].replace(/['"]/g, '') : '';
 
-            if (isChatExternalUrl) {
-              const filename = urlObj.pathname.split('/').pop() || 'file';
+              const filename = decodeURIComponent(
+                matchFilename || urlObj.pathname.split('/').pop() || 'file'
+              );
               const extension = path.extname(filename).replace('.', '');
+
               return {
                 filename,
                 extension,