If you have used the old Paperpile and created shared folders there, you need to migrate them first.
Simply follow the instructions in the left sidebar or visit our guide:
Migrate old shared folders to the new Paperpile
Important: Everyone on your team who wants to keep access or make changes to shared folders, should switch to the new Paperpile. After migration, the shared folders in the old Paperpile app will not synchronize with the new Paperpile, and the migration cannot be redone.
Use shared folders to share parts of your personal library with various people, like a “Reading List” for your students or a “Manuscript” with your co-authors.
Shared folders are regular folders in your library. You can control who has access (view or edit) and decide whether to share your notes and annotations. Your labels are not shared.
https://paperpile.wistia.com/medias/vgxg5l965n
Use shared libraries to establish a central literature repository for a research group, company, or a large collaborative project.
Shared libraries are independent from your personal library and have their own set of folders, shared labels and notes and annotations.