3DS Max to Unreal Engine 4 Turbosmooth does not gets imported

I am trying to import a skeletal mesh from 3DS MAX with the following heirarchy.
Edit Poly → Skin → Turbosmooth

The model gets imported along with the bones perfectly in unreal engine 4 but without the turbosmooth

My checked FBX export options are
1> Smoothing Groups
2>Tangents & Binormals
3>Convert Deforming Dummied To Bones
4.>Triangulate
4.>Preserve Edge Orientation

I’m not sure but shouldn’t the hierarchy be Edit Poly → Turbosmooth → Skin? I just remember having trouble with a modifier after Skin.

The model is low poly which was skinned first to avoid too many vertices handling in weight details.

After the skin modifier the engine does not accept it.

But its working for static meshes having heirarchy Edit Poly–>Turbosmooth