FYI, utorrent has an android app (https://www.utorrent.com/mobile/) which I assume also allows you to create your own torrent file. It is very easy, you just need to follow the guide. You also need to follow the guide on this site on how to create a GT specific torrent, which requires a GT tracker (in the upload guide page). It sounds cumbersome, but it is actually quite straightforward, though as straightforward as a mobile device can be.