How to tell if a photo in the gallery is already in an album

[Cinerobert]

Let's say that I have thousands of photos. Some of them are photos of, say, a pile of rocks that I took over the course of several years. Some of those photos I thoughtfully added to an album called "Pile of Rocks". Others, I forgot. Now I want to go through all my photos and add the ones I forgot to the appropriate album.Problem: as I go through the gallery, there is no way to tell which photos have already been added and which haven't. I essentially have to add ALL the photos of the pile of rocks to the album. I would like to have some way to see from the gallery whether a particular photo i

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