Export from maya and to UE4 problem!!

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how i can make the uv mapping in maya the same as in Unreal engine
also i changed the grid setting but the model is too small
i am using maya 2016

Check freeze transform.

Unreals default texture might be to a different scale than the one used for maya. You need to go into the mesh properties and see if it is the same in the UV viewer

Changing the grid settings wont change the models as well. You need to do that manually.