Moving photos
How do I move photos from one album to another on iPhone 11
Question marked as
There is only one photo stored which can be viewed on multiple albums.
If you add a Photo in an Album then this photo is not stored separately against that album. But you have an option to view from this album too.
If you store a Photo in multiple albums, then the photos do not have multiple copies but are stored in one place and only is viewable from multiple albums.
So, you either have an option to remove from a particular Album or all Albums / All Device including iCloud.