Add img extension (#2172)

* perf: mongo log

* perf: img read

* doc

packages/service/common/file/read/utils.ts

@@ -8,7 +8,8 @@ import fs from 'fs';
 import { detectFileEncoding } from '@fastgpt/global/common/file/tools';
 import type { ReadFileResponse } from '../../../worker/readFile/type';
 
-export const initMarkdownText = ({
+// match md img text and upload to db
+export const matchMdImgTextAndUpload = ({
   teamId,
   md,
   metadata
@@ -79,7 +80,7 @@ export const readRawContentByFileBuffer = async ({
 
   // markdown data format
   if (['md', 'html', 'docx'].includes(extension)) {
-    rawText = await initMarkdownText({
+    rawText = await matchMdImgTextAndUpload({
       teamId: teamId,
       md: rawText,
       metadata: metadata