diff --git a/web/app/components/workflow/block-selector/constants.tsx b/web/app/components/workflow/block-selector/constants.tsx
index f10035bcfd..ab0c9586dc 100644
--- a/web/app/components/workflow/block-selector/constants.tsx
+++ b/web/app/components/workflow/block-selector/constants.tsx
@@ -7,3 +7,25 @@ export const BLOCK_CLASSIFICATIONS: string[] = [
   BlockClassificationEnum.Transform,
   BlockClassificationEnum.Utilities,
 ]
+
+export const DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE = [
+  'txt',
+  'markdown',
+  'mdx',
+  'pdf',
+  'html',
+  'xlsx',
+  'xls',
+  'vtt',
+  'properties',
+  'doc',
+  'docx',
+  'csv',
+  'eml',
+  'msg',
+  'pptx',
+  'xml',
+  'epub',
+  'ppt',
+  'md',
+]
diff --git a/web/app/components/workflow/block-selector/data-sources.tsx b/web/app/components/workflow/block-selector/data-sources.tsx
index 6b2293afa5..294c7c1c79 100644
--- a/web/app/components/workflow/block-selector/data-sources.tsx
+++ b/web/app/components/workflow/block-selector/data-sources.tsx
@@ -10,13 +10,14 @@ import type {
   OnSelectBlock,
   ToolWithProvider,
 } from '../types'
-import type { ToolDefaultValue } from './types'
+import type { DataSourceDefaultValue, ToolDefaultValue } from './types'
 import Tools from './tools'
 import { ViewType } from './view-type-select'
 import cn from '@/utils/classnames'
 import type { ListRef } from '@/app/components/workflow/block-selector/market-place-plugin/list'
 import { getMarketplaceUrl } from '@/utils/var'
 import { useGlobalPublicStore } from '@/context/global-public-context'
+import { DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE } from './constants'
 
 type AllToolsProps = {
   className?: string
@@ -37,14 +38,22 @@ const DataSources = ({
   const pluginRef = useRef<ListRef>(null)
   const wrapElemRef = useRef<HTMLDivElement>(null)
   const handleSelect = useCallback((_: any, toolDefaultValue: ToolDefaultValue) => {
-    onSelect(BlockEnum.DataSource, toolDefaultValue && {
+    let defaultValue: DataSourceDefaultValue = {
       plugin_id: toolDefaultValue?.provider_id,
       provider_type: toolDefaultValue?.provider_type,
       provider_name: toolDefaultValue?.provider_name,
       datasource_name: toolDefaultValue?.tool_name,
       datasource_label: toolDefaultValue?.tool_label,
       title: toolDefaultValue?.title,
-    })
+    }
+    // Update defaultValue with fileExtensions if this is the local file data source
+    if (toolDefaultValue?.provider_id === 'langgenius/file' && toolDefaultValue?.provider_name === 'file') {
+      defaultValue = {
+        ...defaultValue,
+        fileExtensions: DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE,
+      }
+    }
+    onSelect(BlockEnum.DataSource, toolDefaultValue && defaultValue)
   }, [onSelect])
   const { enable_marketplace } = useGlobalPublicStore(s => s.systemFeatures)
 
diff --git a/web/app/components/workflow/block-selector/types.ts b/web/app/components/workflow/block-selector/types.ts
index a5eefe7095..be960b1246 100644
--- a/web/app/components/workflow/block-selector/types.ts
+++ b/web/app/components/workflow/block-selector/types.ts
@@ -46,6 +46,7 @@ export type DataSourceDefaultValue = {
   datasource_name: string
   datasource_label: string
   title: string
+  fileExtensions?: string[]
 }
 
 export type ToolValue = {
diff --git a/web/app/components/workflow/nodes/data-source/constants.ts b/web/app/components/workflow/nodes/data-source/constants.ts
index 6c576df25d..1ff9f722e2 100644
--- a/web/app/components/workflow/nodes/data-source/constants.ts
+++ b/web/app/components/workflow/nodes/data-source/constants.ts
@@ -1,27 +1,5 @@
 import { VarType } from '@/app/components/workflow/types'
 
-export const DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE = [
-  'txt',
-  'markdown',
-  'mdx',
-  'pdf',
-  'html',
-  'xlsx',
-  'xls',
-  'vtt',
-  'properties',
-  'doc',
-  'docx',
-  'csv',
-  'eml',
-  'msg',
-  'pptx',
-  'xml',
-  'epub',
-  'ppt',
-  'md',
-]
-
 export const COMMON_OUTPUT = [
   {
     name: 'datasource_type',
diff --git a/web/app/components/workflow/nodes/data-source/hooks/use-config.ts b/web/app/components/workflow/nodes/data-source/hooks/use-config.ts
index 8624bb98f5..98683e70e7 100644
--- a/web/app/components/workflow/nodes/data-source/hooks/use-config.ts
+++ b/web/app/components/workflow/nodes/data-source/hooks/use-config.ts
@@ -9,7 +9,6 @@ import type {
   DataSourceNodeType,
   ToolVarInputs,
 } from '../types'
-import { DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE } from '../constants'
 
 export const useConfig = (id: string, dataSourceList?: any[]) => {
   const store = useStoreApi()
@@ -36,7 +35,6 @@ export const useConfig = (id: string, dataSourceList?: any[]) => {
       handleNodeDataUpdate({
         ...nodeData.data,
         _dataSourceStartToAdd: false,
-        fileExtensions: DEFAULT_FILE_EXTENSIONS_IN_LOCAL_FILE_DATA_SOURCE,
       })
     }
   }, [getNodeData, handleNodeDataUpdate])