Black screen on android phone

When I export a game with the third person template to my phone, it works fine. But if I change the character to a
custom one, the screen goes black on the phone.
I already checked the default gamemode and the default map.

I appreciate any help

is the custom one maybe too heavy in poly count? I was trying to test exporting some arch viz projects to mobile and too many houses ended up with a black screen, reducing them made it work again.