If you are missing photos after joining an iCloud Shared Photo Library

If you moved photos to a Shared Library, you won't be able to see those photos on an iPhone or iPod touch with iOS 16 or earlier, an iPad with iPadOS 15 or earlier, a Mac with macOS Monterey or earlier, an Apple TV with tvOS 15 or earlier, or a PC with iCloud for Windows 13 or earlier.

iCloud Shared Photo Library is only available on an iPhone with iOS 16.1 or later, an iPad with iPadOS 16.1 or later, a Mac with macOS Ventura 13 or later, an Apple TV with tvOS 16 or later, or a PC with iCloud for Windows 14 or later. If you open the Photos app on a device that hasn't been updated to a supported version, you won't see the photos that you moved from your Personal Library to your Shared Library. Learn more about iCloud Shared Photo Library.

To see your photos, use a device updated to a supported version of iOS, iPadOS, macOS, tvOS, or from any device with any software version on iCloud.com.