In the iOS 16.4 RC update released today, Apple introduced new Emoji symbols, enhanced network push notifications, and other features, as well as duplicate image detection for iCloud shared photo galleries.
Apple has added duplicate image detection to the Photos app in iOS 16. Once the Photos app detects duplicate photos, it displays the number of duplicate photos in the Duplicates folder under the Utilities area. Users can click into this folder and choose to clean up the duplicate photos.
Duplicate image detection was initially limited to the local albums app, but in iOS 16.4 RC, Apple says it can detect duplicate photos and videos in iCloud Shared Photos libraries and reduce unnecessary space usage by merging duplicate photos/videos.