on Project settings : - choose min max 21 , also on NDK -21 and latest - on storage choose AUTO -make sure you are on SHIPPING and DISTRIBUTION -make sure you choose START IN VR ( search it on general settings i think, on bottom) -Check the box that says something like configure for Oculus GO - make sure you made a KEY for android distribution, and copy it on projectname/build/android/
Package : -package on ASTC , for arm7 + OpenGL ES 2
NOTE: Take your time reading oculus docs for ue4, sure they miss same stuff but for most parts its a very good guide!