admin.py is importing main ;) Well, it's running as my user (non-root) with runserver, and /tmp/upload is a directory that I've created before (and no, it didn't work before I've created it either).
What makes me wonder is, that nothing (neither the runserver output, nor the created webpage) indicate an error. Which suggests either a try: except: block that kills any exceptions, and/or an unexpected path in the source :( Andreas