We use Zotero as a reference manager. Please follow the URL below to understand group invitations and how Zotero works. It is an excellent article made by the University of Toronto.
Instructional Video (from setting up to organizing library)
https://guides.library.utoronto.ca/zotero/install
Zotero Group Work
https://guides.hsict.library.utoronto.ca/c.php?g=723855&p=5180957