What is iCloud Shared Photo Library in Photos on Mac?
iCloud Shared Photo Library lets you and up to five other people share photos and videos in a separate iCloud Photos library, so everyone can collaborate on the collection and enjoy more complete memories. You can create or participate in one shared library at a time.
All participants can view, add, edit, favorite, and caption photos and videos from the shared library as if the items were located in their own libraries, and the changes sync to everyone’s devices. Participants can add existing photos from their personal library and capture or import new items directly into the shared library. iPhone or iPad users can also send photos and videos to the shared library automatically when other participants are nearby.
To learn more about creating and managing an iCloud Shared Photo Library, see: