Landscape material transparent in packaged apk game ?

Greetings, first I want to thank Epic Games and the community that is always here to help us.

I’m having tihs problem for days now, and I can’t figure out why. I’m just playing with the FlyingBlueprintTemplate, the landscape is in my level but totally transparent in my .apk (I checked with hit events to confirm), I used the landscape material that is in EngineContent folder and setup all the layers information (grass,dirt and snow), even tried different materials and texture formats, but it doesn’t seem to work :(( ,can someone please help me, I’m fraustrated by this problem x(