How do I set up skybox (6 images) and material for it in UE4 ?
How do I set up stereo skybox for mobile VR ? (basically 2 mono skyboxes with unique material for each, where one skybox renders for left eye only and another one - for right eye only)
I am working on similar issue like yours and I think this link might help you regarding to the skybox creation.
However this method does not use 6-side skybox, instead we use an HDR cube map and blue print.
The image attached demonstrate how the sky box material should be set. and this tutorial will show you how to make the link in BP