UE4 - Impossible to import a rigged mesh with soften edges from Maya, why?

Hi, regular FBX meshes, with soften edges from Maya are easy to import to UE, but if i bind a mesh and rigg it, after importing it to UE, it looses all the soften edges effect, even do every option is enable from both ends, like smooth mesh, normals and binormals, import normals and tangents,

What can i do?

Did you delete non-deformer history in Maya before export?