diff --git a/web/app/components/base/chat/chat/answer/human-input-content/__tests__/utils.spec.ts b/web/app/components/base/chat/chat/answer/human-input-content/__tests__/utils.spec.ts
index 96ecda2430..99bc2363e2 100644
--- a/web/app/components/base/chat/chat/answer/human-input-content/__tests__/utils.spec.ts
+++ b/web/app/components/base/chat/chat/answer/human-input-content/__tests__/utils.spec.ts
@@ -1,7 +1,8 @@
 import type { FormInputItem } from '@/app/components/workflow/nodes/human-input/types'
 import type { Locale } from '@/i18n-config/language'
 import { UserActionButtonType } from '@/app/components/workflow/nodes/human-input/types'
-import { InputVarType } from '@/app/components/workflow/types'
+import { InputVarType, SupportUploadFileTypes } from '@/app/components/workflow/types'
+import { TransferMethod } from '@/types/app'
 import {
   getButtonStyle,
   getRelativeTime,
@@ -10,20 +11,46 @@ import {
   splitByOutputVar,
 } from '../utils'
 
-const createInput = (overrides: Partial<FormInputItem>): FormInputItem => ({
-  label: 'field',
-  variable: 'field',
-  required: false,
-  max_length: 128,
+const paragraphInput = (overrides: Partial<Extract<FormInputItem, { type: InputVarType.paragraph }>> = {}): FormInputItem => ({
   type: InputVarType.paragraph,
-  default: {
-    type: 'constant' as const,
-    value: '',
-    selector: [], // Dummy selector
-  },
   output_variable_name: 'field',
+  default: {
+    type: 'constant',
+    value: '',
+    selector: [],
+  },
   ...overrides,
-} as unknown as FormInputItem)
+})
+
+const selectInput = (overrides: Partial<Extract<FormInputItem, { type: InputVarType.select }>> = {}): FormInputItem => ({
+  type: InputVarType.select,
+  output_variable_name: 'field',
+  option_source: {
+    type: 'constant',
+    value: ['option-a', 'option-b'],
+    selector: [],
+  },
+  ...overrides,
+})
+
+const fileInput = (overrides: Partial<Extract<FormInputItem, { type: InputVarType.singleFile }>> = {}): FormInputItem => ({
+  type: InputVarType.singleFile,
+  output_variable_name: 'field',
+  allowed_file_extensions: [],
+  allowed_file_types: [SupportUploadFileTypes.image],
+  allowed_file_upload_methods: [TransferMethod.local_file],
+  ...overrides,
+})
+
+const fileListInput = (overrides: Partial<Extract<FormInputItem, { type: InputVarType.multiFiles }>> = {}): FormInputItem => ({
+  type: InputVarType.multiFiles,
+  output_variable_name: 'field',
+  allowed_file_extensions: [],
+  allowed_file_types: [SupportUploadFileTypes.image],
+  allowed_file_upload_methods: [TransferMethod.local_file],
+  max_upload_count: 5,
+  ...overrides,
+})
 
 describe('human-input utils', () => {
   describe('getButtonStyle', () => {
@@ -54,15 +81,13 @@ describe('human-input utils', () => {
   })
 
   describe('initializeInputs', () => {
-    it('should initialize text fields with constants and variable defaults', () => {
-      const formInputs = [
-        createInput({
-          type: InputVarType.paragraph,
+    it('should initialize paragraph fields with constants and variable defaults', () => {
+      const formInputs: FormInputItem[] = [
+        paragraphInput({
           output_variable_name: 'name',
           default: { type: 'constant', value: 'John', selector: [] },
         }),
-        createInput({
-          type: InputVarType.paragraph,
+        paragraphInput({
           output_variable_name: 'bio',
           default: { type: 'variable', value: '', selector: [] },
         }),
@@ -74,23 +99,45 @@ describe('human-input utils', () => {
       })
     })
 
-    it('should set non text-like inputs to undefined', () => {
-      const formInputs = [
-        createInput({
-          type: InputVarType.select,
+    it('should initialize select fields with empty strings', () => {
+      const formInputs: FormInputItem[] = [
+        selectInput({
           output_variable_name: 'role',
         }),
       ]
 
       expect(initializeInputs(formInputs)).toEqual({
-        role: undefined,
+        role: '',
+      })
+    })
+
+    it('should initialize single file fields with null', () => {
+      const formInputs: FormInputItem[] = [
+        fileInput({
+          output_variable_name: 'avatar',
+        }),
+      ]
+
+      expect(initializeInputs(formInputs)).toEqual({
+        avatar: null,
+      })
+    })
+
+    it('should initialize file list fields with empty arrays', () => {
+      const formInputs: FormInputItem[] = [
+        fileListInput({
+          output_variable_name: 'attachments',
+        }),
+      ]
+
+      expect(initializeInputs(formInputs)).toEqual({
+        attachments: [],
       })
     })
 
     it('should fallback to empty string when variable default is missing', () => {
-      const formInputs = [
-        createInput({
-          type: InputVarType.paragraph,
+      const formInputs: FormInputItem[] = [
+        paragraphInput({
           output_variable_name: 'summary',
           default: { type: 'variable', value: '', selector: [] },
         }),
diff --git a/web/app/components/base/chat/chat/answer/human-input-content/utils.ts b/web/app/components/base/chat/chat/answer/human-input-content/utils.ts
index ecf82f6f7c..c5e90fbf63 100644
--- a/web/app/components/base/chat/chat/answer/human-input-content/utils.ts
+++ b/web/app/components/base/chat/chat/answer/human-input-content/utils.ts
@@ -7,7 +7,10 @@ import isSameOrAfter from 'dayjs/plugin/isSameOrAfter'
 import relativeTime from 'dayjs/plugin/relativeTime'
 import utc from 'dayjs/plugin/utc'
 import {
+  isFileFormInput,
+  isFileListFormInput,
   isParagraphFormInput,
+  isSelectFormInput,
   UserActionButtonType,
 } from '@/app/components/workflow/nodes/human-input/types'
 import 'dayjs/locale/en'
@@ -47,7 +50,19 @@ export const initializeInputs = (formInputs: FormInputItem[], defaultValues: Rec
       return
     }
 
-    initialInputs[item.output_variable_name] = ''
+    if (isSelectFormInput(item)) {
+      initialInputs[item.output_variable_name] = ''
+      return
+    }
+
+    if (isFileFormInput(item)) {
+      initialInputs[item.output_variable_name] = null
+      return
+    }
+
+    if (isFileListFormInput(item)) {
+      initialInputs[item.output_variable_name] = []
+    }
   })
   return initialInputs
 }