How to upload multiple Photos libraries to a single iCloud Photo Library

Take extra care if you want to upload many photo libraries to one iCloud Photo Library. You could end up with duplicate photos.
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Apple

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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.