Finding all the albums for one photo

Photos does not provide a way to show how many albums a photo is in, but regardless of how many albums a photo appears in, that still is just one copy of the photo itself.

Also, regarding 'cleaning' out duplicates, see either of the following regarding how many copies of images there actually are on your drive:

Photos saves disk space by sharing images with your iPhoto or Aperture libraries - Apple Support

Six Colors: The (hard) link between Photos and iPhoto

That is not a feature of Photos - tell apple your needs - https://www.apple.com/feedback/photos.html

And photos being in multiple albums are not duplicates - just like Aperture albums are logical ways to view photos - not physical locations = the photo is only in the library once but viewed from different albums

LN

I didn't use iPhoto, only Aperture and I've noticed the sharing of image since both my Aperture image library and Photo image library were about 60GB, but when I deleted the Aperture photo library I didn't save 60GB from my hard drive.

When you migrated your Aperture Library to Photos Library, your files were NOT duplicated. Both apps use hard links to the same files on your disk. That's why deleting the Aperture Library did not regain you 60 GB of free space. The only thing you actually deleted are the database files that were needed by Aperture.

This is the same notion that R C-R is trying to explain about Albums not duplicating images. Please read the articles he so kindly provided to you.

Pierre Neihouser wrote:

Smart album with "Album", "is not" and "Any" criteria would work?

Yes, that will show you photos & videos that are not in any album.