I just went to mobile documents and checked the "documents" file, but it's empty. Not sure why it's showing 2 documents or files in FAF that I can't get rid of. Mobile documents showed up under iCloud Drive so not even there. I probably don't have to worry about it, but it's nice to get all files of an app gone.
Whatever's in ~/Library/Mobile Documents isn't supposed to be visible...don't ask me why, though, but as I said
The solution looks like navigating to ~/Library/Mobile Documents and deleting the entire folder. It shouldn't cause you any problems, because you don't use iCloud.
Just delete the entire folder.
