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If you see Unable to Upload in Photos on Mac
When you check the status of your library at the bottom of the Photos app on your Mac, iPhone, iPad or Apple Vision Pro, you might see that some photos or videos are unable to sync to iCloud. You might also see a status message that says “Couldn’t Sync [number of items] to iCloud” and Unable to Upload in the Photos app.
To add these photos or videos to iCloud, you can try exporting them from the Photos app and importing them again. Any edits or keywords that you previously applied to these photos or videos will be lost. See the AppleCare Support Article: If you see Unable to Upload in the Photos app.