Is there a way to merge duplicate photos in ICloud
Can you remove duplicate photos in iCloud storage?
iPhone 13, iOS 16
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See the article Find and delete duplicate photos and videos on iPhone - Apple Support
The Photos app 
identifies duplicate photos and videos in your photo library in the Duplicates album. You can merge duplicate photos and videos to save space and clean up your library.
- Tap Albums, then tap Duplicates below Utilities.
- Duplicate photos and videos appear next to each other.
- Tap Merge to combine the duplicates, then tap Merge [number] Items.
- Merging combines the highest quality version and all of the relevant data across the duplicates, and keeps that one in your library. The remaining duplicates are moved to the Recently Deleted album.
The photo library is set up from iPhone and merging duplicate photos from it will also reflect in iCloud .