After a nice intuitive 3D CAD viewer to embed into of link from our website.  We use Solidworks and want to be able to upload or link files to the viewer on our website. 

Website is Squarespace so compatibility there would be good. 

Ability to make transparent, hide & isolate would be good as well as being able to add notes and callouts.

We have been recommended Sketchfab but looks fairly basic on user interface from initial look.

Please provide a link to an example if you can

Cheers

Darin