While Zotero stores all data locally on your computer by default, Zotero's sync functionality allows you to access your Zotero library on any computer with internet access. Zotero syncing has two parts: data syncing and file syncing.
With groups, you can collaborate remotely with project members, set up web-based bibliographies for classes you teach, and share your own work or sources you have discovered with others who are working in related areas.
Note: You must be logged into your Zotero account to do this.
Setting Up Groups
First, set up Zotero sync and synchronize your library. You must be logged in to the zotero.org website to create or join a group.
To create a shared library, click the Create Groups button near the top left of your Zotero window (small blue/green button with two “people” icons, second from the left).
To join an existing Zotero library, search for it at zotero.org/groups or be invited by the group’s owner.
You now have two sections in your Zotero collections pane: "My Library" and "Group Libraries."
Personal and group libraries are entirely separate, and changes made to items in one library do not affect the other. You can drag items back and forth libraries to copy items.
Search for existing public groups or create a new group. Groups may be public (searchable, and anyone can join) or private (users can only join if invited).