Thanks for this 
Already had the stereo cubemaps, but now there is no more need for converting the images to .dds with Photoshop, which improves the workflow.
BTW do you happen to know a fix for the severe aliasing of edges in the images with the GearVR? The images render perfectly crisp in the ORBX viewer but in UE4 they have severe aliasing. I have tried a lot of different settings (anti-aliasing, mipmaps, etc.) but can’t find a fix. Would it be because UE4 renders each eye at 1024x1024 instead of the max device resolution?