iCloud Photo Library requires copying images to the Photos for OS X app

Photos lets you reference images as well as duplicating them into its library, but it won't upload them to iCloud.

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Apple

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Glenn Fleishman is the author of dozens of books. His most recent include Take Control of Your M-Series Mac, Take Control of Securing Your Mac, Take Control of Zoom, and Six Centuries of Type and Printing. In his spare time, he makes Tiny Type Museums. He’s a senior contributor to Macworld, where he writes Mac 911.