CommentStreams:D82a729995a655f6f1c4ad7873bd5aba

I tried using it, but honestly it's way too convoluted and it doesn't have the same freedom as the Upload File page - where as there I can skip any warnings and not add a description or something else, in Upload Wizard I'm forced to do all of that.

While googling for how to upload many files at once, I found something about Special:MultipleUpload. Maybe you could try that instead?