How to make sure you don’t delete referenced images in Photos for macOS

You can choose to reference instead of copying images into the Photos library, but that makes it possible to delete them accidentally, too.
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Glenn Fleishman’s most recent books include Take Control of iOS & iPadOS Privacy and Security, Second Edition (covering iOS 15/iPadOS 15), 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.