Khurram hte problem isn't that he doesn't have it. if anything he does. the problem is, and i've experienced this too, you can't download the folder from your drive, you can only restore from it. ios, being the typical proprietary shit that it is from apple, doesn't allow any other import source other than icloud.
just for the sake of aksing, you do have google drive installed on the iphone right? like, maybe if it isn't there, that's why it isn't working? maybe installing it will give you the google drive option for restore? i doubt you're that oblivious if you can root a phone, but as sherlock puts it:
nothing is more elusive than an obvious fact