There are a couple things that need to be fixed on Special:Upload before it's ready for prime-time:

* The desktop version has some Javascript that runs once the file is selected. This Javascript fills in the 'destination filename' field, generates a thumbnail of the image, and also checks to see if the file already exists on the wiki. This Javascript doesn't run in the mobile version.

* The styling in the form needs to be cleaned up a little, mostly just adding some margins here and there.