With the third betas of iOS 16, iPadOS 16, and macOS Ventura that went out to developers this morning, Apple has added support for iCloud Shared Photo Library, a new feature that was not in the initial betas.
iCloud Shared Photo Library is designed to make it easier for you to share photos with your family members, and after installing iOS 16, iPadOS 16, or macOS Ventura, it can be set up in the Settings app. Under Photos, scroll down to “Shared Library” and tap it.
From there, tap on “Start Setup” to add participants you want to share with. You can invite up to five other people, and all participants can add, edit, or delete content from the shared library. You can add any five people, including people who you do not have a Family Sharing setup with.
Read more at MacRumors.com