I used it to paint some rocks on my terrain. Works fine in PIE (ES2, SM5), but not on the device. Why?! (I am guessing same story as with HISM - PC and consoles fully supported, including VR; perhaps mobile supported, but mobile VR as Gear VR doesn’t seem to be)
PIE:
https://s32.postimg.org/5jvkpp9mt/ue4_gearvr_foliage_PIE.png
Device:
https://s32.postimg.org/hpoyhu1it/ue4_gearvr_foliage_Device.jpg