Sorry for the throw together.. please read..
If you plug your headset into the pc and there’s no file tree, open Oculus app on your phone and turn off Developer mode then back on, put on head set and re give permissions.
There is a working ver. of Samsung VR ( some tweaking)
Down load link for files and instructions for viewing movies from USB. https://drive.google.com/file/d/18AebubQxthwmrnJHhng_CxHRj8djL0qb/view?usp=sharing
Best USB key for this: