Building a moving head

Hello @Quetzalcodename

Please find blinder export setting attached.

I just tried export BASE , YORK, HEAD individually from blender with the same setting. I do noticed when I import BASE fbx, Unreal has an error :
could not be created because all of its polygons are degenerate

Then I clean up in blender, it did imported into unreal, but the pivot point of the head still not behaving correctly.

Also becasue the original 3d model was exported from Vectorworks, in blender the mesh was composed by multiple faces , it certainly doesn’t seem to be a clean model.