When Mimeo Photos can't locate the photos from your project in your Apple Photos Library it will display this message:

If you deleted the photo by mistake, you can check the Recently Deleted folder and recover it. In addition, you can also review Apple's article on Getting Help with Missing Photos.

If you didn't delete the photo(s) they may have existed on removable media such as a hard disk or flash drive. Also, the photo(s) may be on your local hard drive, but not in Photos.

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