If you do a search in the App Store, there are plenty of programs - some free, some with a charge - that look for duplicates. I did it when I moved my Lightroom library to Photos (forget which one) but it worked fine.
If you do a search in the App Store, there are plenty of programs - some free, some with a charge - that look for duplicates. I did it when I moved my Lightroom library to Photos (forget which one) but it worked fine.