Description of the need In rich text editor in image details, users are allowed to click the insert or update button even if they do not have a file chosen.

Proposed solution You could block the "Update" button until an image is added or have a popup to notify the user that they do not have an image selected when clicking insert/update.

Additional information Inserting an non-existent file: no-file-insert

Updating after a file is removed: no-file-update

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/3900
GitHub Issue #: 
3900