Duplicate files · Where it looks and what it skips
Does Storage Studio find duplicates inside my Photos library?
Short answer: No. The Photos library is a package managed by the Photos app, and Storage Studio never reaches inside it. Photos saved as ordinary files in your checked folders are compared. For the Photos library itself, use the Duplicates album in the Photos app to review and merge.
No. The Photos library is a package that the Photos app manages, and Storage Studio never reaches inside it — removing a file from inside it directly could damage the library. Photos you've saved as ordinary files in your Pictures, Downloads or other checked folders are compared as usual.
For pictures inside the Photos app, use Photos itself: on recent versions of macOS, Photos shows a Duplicates album in its sidebar where you can review and merge duplicate photos. Merging there keeps the best-quality version and combines the details.
The same applies to other app-managed libraries, such as music or video editing libraries: manage their contents in the app that owns them.