That’s a technical issue. At the moment, the add-on is not well connected to the rest of the Paperpile app. It lives within Google docs in kind of a sandbox and it’s hard to get out. But we have plans and ideas how to properly link the content for users that have a Paperpile library.
Please note that the add-on is fully functional also for users without a Paperpile account and we focused on this use case first.