need help in transporting blender to un4

hi guys i am trying to transport a box that i made in blender to unreal. now my problem is that when i try to put it to unreal i always have a weird shadow result like this35948b0a6eece20c62f89c2eef3edbde4750f825.jpeg

Make sure the UVs are laid out correctly and build the scene as well. It could be a lighting issue as well but I think it could be an export issue.

yeah i was thinking about exporting issue too…can u give me an instruction on how to export correctly ?