Cloud 24.2.2

From the attachments panel on an object (e.g., NCR) I have a user that is able to edit a document revision; the Edit icon is visible.

After check-out, the check-in icon and the check-in command are not visible, so the user cannot perform a check-in at the Attachments panel. The user can navigate to the Document Revision and perform the check-in there.

Any ideas on what might be causing this as it appears all the other relevant icons/commands are available?