Poly Faces Missing/Not Showing in Unreal Engine

Sagnik18

I tried to import my character in unreal engine 4.25 but some faces were missing or not showing. but the model looked perfectly fine in other software like maya, Substance painter and marmoset toolbag. I tried using 2 sided lighting but it didn't help. 
I need a solution for this very urgent,  please help !!!!!

Obscura

Hi. I would say your model is probably very small and you just upscaled it in the viewport. Try importing it with 100x scale.

Sagnik18

Thank you very much that was indeed the problem, the model was to small.