OK, I have a Rift and some 3D movies, while I was researching on how watch it in the Rift I saw in the Q&A from Oculus that the only thing you need to do is to change the file name into a particular way in order to watch it in your Gear VR (Powered by Oculus).
Here the complete info:
https://support.oculus.com/help/oculus/901894079905459/
Well, welcome to the forum and I hope this info helps you.
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