3dsmax morpher doesn't save smoothing groups


I’ve got problem with editable mesh + morpher + skin modifier. In engine there are no smoothing groups which should be exported.

Object (“edit normals” just for preview):

Export to fbx settings (mesh + 2 bones)

Import options:

Final effect:

Morpher is working but smoothing groups were completely reset.

edit: After deleting Morpher from the stack - smoothing groups started to working in unreal…