Indeed I've seen other comments in this thread that indicate the same. I tested sending an email with the word "attachment" in it, with no attachment, and Gmail

Indeed I've seen other comments in this thread that indicate the same. I tested sending an email with the word "attachment" in it, with no attachment, and Gmail didn't have any problem sending it. I tested it with my work email on Google Workspace, and it showed the popup. It must be a setting. Weird. EDIT: After toggling experimental features on, then off again, it now works. ¯\(º_o)/¯