When desiring to upload models, GrabCAD's upload dialog box has a Dropbox entry. I use Dropbox to share files with clients. How does GrabCAD work with Dropbox?
Check the permissions box for Dropbox Sync
The grabcad model will change when you edit your model in dropbox
Dropbox viewer is only available for certain people to test. Let know if you would like to be part of the Insiders list.