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Read this about how to free up storage Free up storage space on your Mac - Apple Support

Use iCloud Photos to store photos in iCloud - Apple Support

Optimize Mac Storage: Stores smaller versions of your photos on your Mac when storage space is limited, and keeps the original, full-size photos in iCloud. Choose this option to conserve space on your Mac. To restore the originals to your Mac, just select “Download Originals to this Mac.”

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You have the answer. You must free up disk space to be able to do what you want.

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