Double check your info.plist file. The Allows File sharing tick box is right under the device types that you edit. Make sure it's still enabled?
Other than that, right under the app list in iTunes is where the file sharing is. Should show up in that list. I'm sure I'm stating the obvious though.
If you want to manually add them SSH into /User/Applications and you'll have to figure out which of the numbered folders the app is in. Just put your movies into the documents folder.
Good luck