Nope, I don't have an android phone. Does Conversation use the providers you mentioned for uploading files? If you can seemlessly send files using Conversation and they appear inline like text messages, then yes, this is what I'm looking for. I've tried Jitsi, it doesn't support server based file transfers, and I've experienced "lost messages" with their own service (jit.si). I've also experiences lost messages with google talk (when it supported xmpp).