3DMax model import engine model normol is wrong and model the back of the model is gone

Development Asset Creation
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1

I created a villa of my own, but after i import it into UE4,the back of the model is gone,but Check the normal before exporting. I’ve used copy and symmetry commands in modeling,Is there any problem in this?

2

Can you upload some screenshots of the mode from different views in Unreal Engine 4?