3D Viewer don't handle Solid Primitives in Step Files

I guess that there is something missing in the "Step" file import.

it looks like primitives don't show.

on the left 3 primitives in Fusion 360: a torus, a Sphere and a coil
on the upper right window, the view in 3D viewer wher only the Ends of the coil are converted.
in the bottm right window in Stager all looks fine.