KeyShot 10 does not currently support importing models created in Rhino 7.
Our team is currently working on this and will have a resolution on our next update.
As a work around for this you can try:
Export your Rhino file as a Rhino 5/6 file type.
How to export as a Rhino 5/6 file:
1) Go to the Rhino menu > View* and select *Shaded*
2) Click on *File> Save as
3) The Save window will appear
4) Change *Save type as: *Rhino 5/6 3D model. and click save.
5) Launch KeyShot
6) In KeyShot, click *File> Import* and import your Rhino 5/6 file.
If you are still having issues you may contact our Support team Directly at Suppot@Luxion.com