fix: #567 use modal to upload files in the knowledge base (#601)

### What problem does this PR solve?

fix:  #567 use modal to upload files in the knowledge base

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/utils/documentUtils.ts

@@ -42,3 +42,7 @@ export const getExtension = (name: string) =>
 export const isPdf = (name: string) => {
   return getExtension(name) === 'pdf';
 };
+
+export const getUnSupportedFilesCount = (message: string) => {
+  return message.split('\n').length;
+};