uhm ... a form-base upload is only a HTTP POST Request, isnt it?.
so it should not make a difference weither you send that POST via an applet or form. Rails only sees a POST Request coming in, it cant see if it was eend by a applet,by an ajax call or a form or whatever....
in all cases, the file should be acceccible through the params hash.
dont see where the problem is. or am i missing something?