However, accessing the site with my administrator account (Windows Authentication side), I am able to see the rest of the window, including the 'ADVANCED' option and who the document is currently shared with.
The claims based users all have 'Edit' permissions. I'm assuming that since it works on my admin user, it must be a permissions issue. Is 'Edit' not the correct solution? What is the type of permission needed to share?
When I click 'INVITE PEOPLE' with the claims-based users, I get an error.