Problem is apple sucks. Just kidding, but not really. I believe that apple iPhoto deletes your local copy after it's backed up to the cloud. All you're really seeing, and trying to upload, is essentially a thumbnail. If you want to upload those pics you'll need to download them back to your device first. This is the explanation I received from apple support once, years ago, just prior to switching to Samsung. Cause like I said, apple sucks.