fix: upload Output format String (#1907)

# Description

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also include relevant motivation and context. List any dependencies that
are required for this change.

# How Has This Been Tested?

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# Checklist:

- [ ] My code follows the style guidelines of this project
- [ ] I have already rebased the commits and make the commit message
conform to the project standard.
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] Any dependent changes have been merged and published in downstream
modules

web/components/flow/canvas-node.tsx

@@ -23,7 +23,7 @@ type CanvasNodeProps = {
 function TypeLabel({ label }: { label: string }) {
   return <div className='w-full h-8 align-middle font-semibold'>{label}</div>;
 }
-const forceTypeList = ['file', 'multiple_files', 'time'];
+const forceTypeList = ['file', 'multiple_files', 'time','images','csv_file'];
 
 const CanvasNode: React.FC<CanvasNodeProps> = ({ data }) => {
   const node = data;

web/components/flow/node-renderer/upload.tsx

@@ -29,7 +29,7 @@ export const renderUpload = (params: Props) => {
     if (data.ui.attr.max_count === 1) {
       formValuesChange({file:urlList.current.toString()},{force:true})
     }else{
-      formValuesChange({multiple_files:urlList.current},{force:true})
+      formValuesChange({multiple_files:JSON.stringify(urlList.current)},{force:true})
     }
   };
 
@@ -41,7 +41,7 @@ export const renderUpload = (params: Props) => {
     if (data.ui.attr.max_count === 1) {
       formValuesChange({file:urlList.current.toString()},{force:true})
     }else{
-      formValuesChange({multiple_files:urlList.current},{force:true})
+      formValuesChange({multiple_files:JSON.stringify(urlList.current)},{force:true})
     }
   };