Thanks for the comment! =D
It used to be for this purpose--I have a whole bunch of pictures to upload, but I don't want to spam the Recent Uploads with just my stuff, so I mark it as Mass Upload and it bypasses Recents straight to my Gallery.
The one time I want to use it, I can't, eh?
What /does/ the mass upload button do anyways? Just wondering because I'm new here... But I really like this, and all the other ones you recently posted XD