Problem: a few photos won't import into Photos on new mac mini
Today I copied five .jpg photos (which came originally from my iphone but had been saved to my old pc) to my new mac desktop (which shows thumbnails of the photos), and which I can view without issue on any of my other apple and pc devices - not to mention can be viewed without issue in Preview on this same new make. Unfortunately, those five .jpgs refuse to be imported into Photos. Photos continually gives the error message: "Cannot Import Item. Reason: Unknown". I have imported thousands of other photos on previous days and today without issue, some taken at the exact same time as these problematic photos.
Anyone know why this might be the case and how to fix it?
Mac mini, 12.0