The low rating of this app made me curious, because for me everything worked just fine. Then I noticed that most reviewers have actually missed some rather basic things, such as how to start the app (just read Azeem's replies) or how to allow it to save to drive (just read Azeem's replies) or how to open the drive file later (hey, guess what, just read Azeem's replies).
Azeem, I don't know you man but really, top-notch support and nerves of steel! Good work! :)
Oh, did I mention the adverts? Right... so... how can an honest developer make a buck these days? Few people seem willing to donate, so until the world is a bit more respectful towards this work, of course we need to use adverts to make something off countless hours of effort put into something.
So yeah... that about covers it. Oh, right, one more thing: how do I donate to you Azeem?