Since Better File Browsing became standard 2015-06-06, teachers and TAs at our institution sometimes report difficulty with creating new folders in the Files tab of a course. They press +Folder and see the entry blank to type a new folder name:
However, they're not always certain what to do after typing that name -- which is to press the Enter key. An X button is provided onscreen, and it's relatively clear that this is how one cancels folder creation. It will be awesome when a similarly discoverable cue is provided for completing folder creation.