I was quite surprised to learn that files are uploaded immediately as soon as you drag&drop files. This was all the more surprising as my first two uploads failed because of a CSRF token error (as the token has timed out already).
If this immediate upload behavior is intended, I'd expect it at least to be ...
- documented on the MediaWiki extension description page and
- even more important: documented on the special page <tt>Spezial:BatchUpload</tt> itself.
It is a good extension - thank you very much for that! But please explain the behavior so that users know what will happen if they use this extension.
Every single upload normally would be implemented with first providing the files, then submitting them. That's what users would expect. That's what they assume in the first place. It's okay if this extension differs from this expected behavior, but then please document it/explain it! ;-)
Nevertheless: Thank you again, nice extension!