Problem
The form shows an error saying a file is required, and you cannot save the document.
Possible cause
Every document must have a file attached. If you removed the existing file without uploading a new one, the form triggers this validation error.
Solution
Drag a file onto the upload area, or click it to browse your computer.
Select the correct file and wait for it to appear in the upload area.
Then click Save changes again.
If the problem persists, contact support and include details about:
The error message shown.
The file format and size of the file you are trying to upload.
When the issue occurred.