ActiveResource and file uploads

I am trying to figure out how I could ActiveResource with one of my web services. I have a desktop application which basically sends and receives data to and from the server via AMF. (It is an Adobe AIR application for multiple platforms.)

I'm using RubyAMF as the remoting gateway and Rails v 2.2.2 as the base of my web application.

I've managed to get file uploads work with ActionPack and save the entries into an ActiveRecord model, but I also need to get file uploads work. After some research I couldn't find relevant tutorial and/or post on the net. Also, Also, I've read somewhere that ActiveResource does not support multipart type data... That's not too promising either.

Anyone has experience with this approach? Thanks in advance.