How to consolidate media from old apps into a single Photos library

A lot of us have cruft and duplication, but it’s possible to reduce it with some third-party help.
imac photo stock
IDG

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Glenn Fleishman’s most recent books include Take Control of Zoom, Second Edition, Take Control of Your M-Series Mac, and Take Control of Securing Your Mac. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.