Uhm, it's a while ago now, but I think I published it as flash file or something. Isn't there a button called "publish" in flash?... Or maybe "export"
Sorry I don't remember it very well, but I'm pretty sure it has to be saved/exported/whatever as a macromedia flash (.swf). Otherwise I'm sure you can find some guides on youtube or google, if what I said doesn't work x3
Uploading flash, huh? Can't wait to see