I made a landscape and tried to render it on android phone. But same world grid material problem. Mobile stats show 8 texture samplers. I read somewhere that opengl es3.1 support will make it 16. So, i enabled it on my project, tried mobile previewing on es3.1 devices but still the problem remains. Can those mobile samplers be increased to 16 coz I hope that will solve my problem. Please tell what else can i do… 
I use ue4 version 4.15.3