If a partner changes a file (edits a part or adds line) how can i see it or track it through GrabCAD?
Your partner can upload a new version, leave a sketch, or write a comment to let you know about a change. If you have notifications setup, then you'll get an email when any of these happen.
You can also compare changes between versions, which is very useful. For a visual comparison of what is different from one version to the next, see the steps, below.
Answered with a tutorial: https://grabcad.com/tutorials/how-do-i-track-changes-by-others