From what I read in the app description in iTunes on my computer, you need some sort of account and you use this with a desktop program as well. Files are uploaded to a server???
I see no mention of file sharing in the app description.
BTW, you cannot add an app to file sharing - it has to suppport file sharing on it's own - it must be built into the app. If the app supports file sharing, it will be in the file sharing apps list in iTunes.