When uploading files in the Files manager, users gets a proper warning about file quota being full if they try to upload a file that exceeds the remaining storage.
However, in the Page editor, uploading a file just fails silently without giving any warning at all. (Attached GIF.)
In the Module editor, when trying to upload a file that exceeds the storage quota, it just gives the error "Failed to Create new Item", which is also not that helpful.
It would be more user friendly if those the Page and Module editors also give a proper warning about the file storage being full when users try to upload too many/big files.