I tested subd in Rhino 7 as picture below:
I also create a cube to test apply material.
After finish in Rhino 7. I save as to Rhino 6.
I create new file Rhino 6. Use Insert feature/set as Group.
They keep all layer + shape of model. 1 subD object and 1 simple cube.
But When I link to Twinmotion. They did not show subD object. They only show layer name but there are no model.
shared.rar (205.6 KB)