Google-integrated organizations that signed up for Jostle through the Google Marketplace have some extra functionality in Library.
If you haven't already initialized your Library, you will need to create a user for it in your Google domain first. See this article for full details on how to initialize your Library.
Jostle uses a Google user and creates a Google Drive volume that is private to your organization. You can use an external Google Drive client to keep a local copy of your documents in sync with your Jostle Library. However if you do this you should modify files in Library rather than in Google Drive directly.