Uploading solidworks assemblies to GRABCAD?

Yes, I would also suggest Pack And Go. The Pack and Go functionality gathers all related files for a model design (parts, assemblies, drawings, references, design tables, Design Binder content, decals, appearances, and scenes, and SolidWorks Simulation results) and copies them into a folder or zip file.

Yes doing a Pack and Go will save all the files as a zip. If you have additional files such as jpegs, spreadsheets etc that you would like to include you can just make a zip through windows..

JUST add all the files into a winrar zip archieve or zip file..and then upload it :)

I think pack and go with option to save as zip.

Thanks for the help!