With the iCloud Shared Photo Library feature, you can set up or join a shared library to share photos and videos with up to five friends or family members. You and those close to you can collaborate on the photo collection and enjoy more complete memories, all in one place. You can belong to one shared library at a time.
When you join a shared library, the photos and videos that you contribute move from your personal library to the shared library, and all members of the library can view, edit, and delete them. Shared library photos and videos are integrated seamlessly in the Photos app alongside your personal content, but you can also use a filter to quickly on your iPad.
Tap your account in the top-right corner.
Tap Shared Library, then follow the instructions onscreen to add participants and move photos and videos into the shared library.
Note: Photos and videos you add to the shared library don’t appear in your personal library; see on your iPad.
Tap Manage to the right of Shared Library, then tap one of the following:
Delete Shared Library: When a shared library is deleted, participants who have been members of the shared library for more than 7 days can copy everything from the shared library into their own libraries. Participants who have been members for less than 7 days can copy only the content they contributed.
Leave Shared Library: When you leave a shared library, you can copy everything from the shared library into your own library, or just the content you contributed.
All content added to a shared library counts toward the iCloud storage space of the library organizer. See Apple Support article: How to use iCloud Shared Photo Library