Can not replace file in Edit action

[billdagou]

After updating some codes to get the extension working in TYPO3 v9, I could upload the image in NewAction. However, when I tried to edit the record and upload another file, the new file was uploaded, but the record was not updated.

BTW, I noticed in the EditAction, the uploaded file was always prefixed with "file:", should be the ID. Not sure if it's a bug in extbase. TYPO3 v8 works well.