Just tried that and obviously you're correct, it does allow multiple uploads. However, they all have to be to the same category the way it's set up now.
I'd like to have it allow you to select each category individually. Of course that would complicate things and folks would probably say "how come we have to tell it which category for each one?" but at least some of my members apparently like to upload to multiple categories at once, since they mentioned they can no longer do so.