Missing things in android

i make google android device vr project in ue4 i plug in my device and launch on it it works yes my phone opens the game but some actors missing look this is normal pc version but i android the girl on the back is missing , the text on top of them are all missing too and the ground material is missing and my monsters dont spawn i tryed atc ,etc1, etc2 ,android multy but none of them works and i dont what causes that