When setting up Skeletal Mesh LODs, groups within an LOD Group in Maya are now accepted on import as of 4.12. However, it only brings in one mesh from the group.
See attached image and fbx
1. Download the attached FBX
2. Import into UE4 with "Import Mesh LODs" enabled
3. Open the skeletal mesh in Persona
Result: There is no head. LODs work (there is a stretched vertex on each LOD level
Expected: All parts of the mesh are imported
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-28315 in the post.