This widget is very often use in the platform but it no longer corresponds to today's uses in term of file upload.
User needs to add or remove its file faster:
- the comprehension of the field should be immediate
- the feedback in case of wrong file (too heavy, not supported / relevant extension) should be done before the upload
- the widget should be consistent (for now there is 2 lines if you don't have no file - none & upload -, 3 if you already have a file - keep, upload, delete.). It complicates the understanding for users that are already familiar with file upload (mails, facebook, …)