fix:custom file extension not support (#10759)

Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>

web/app/components/base/file-uploader/utils.ts

@@ -44,12 +44,6 @@ export const fileUpload: FileUpload = ({
 }
 
 export const getFileExtension = (fileName: string, fileMimetype: string, isRemote?: boolean) => {
-  if (fileMimetype)
-    return mime.getExtension(fileMimetype) || ''
-
-  if (isRemote)
-    return ''
-
   if (fileName) {
     const fileNamePair = fileName.split('.')
     const fileNamePairLength = fileNamePair.length
@@ -58,6 +52,12 @@ export const getFileExtension = (fileName: string, fileMimetype: string, isRemot
       return fileNamePair[fileNamePairLength - 1]
   }
 
+  if (fileMimetype)
+    return mime.getExtension(fileMimetype) || ''
+
+  if (isRemote)
+    return ''
+
   return ''
 }