I am leaving this forum as posting here is a total waste of time. It would appear that they do not care care enough to read about this problem and fix it. I am very annoyed with the amount of time I have wasted trying to recover my lost photos from old back ups, but also very upset that many photos of people, places and memories have been lost forever as it was after several overwriting backups that I discovered about a 3rd of my photos had been corrupted in the transfer of the old library system. Even the ones I have recovered have been stripped of all metadata, so I have thousands of photos with no dates, locations or camera info. This is really not good enough.
I have for years made several backups of music, photos and other files, but never expected the actual software I was using to cause me this amount of distress. All recovered photos now exported from Photos and will never ever trust another one of their products. And finally NO - I will not be forced into paying more for cloud storage, by factoring in what I can only assume to be deliberate programming glitches. It was the numerous failed syncs with phones and pads that also caused these corruptions, many of which occurred whilst online with a so called expert.
I wish the rest of you the best of luck but strongly suggest you find another platform to store and edit your important data.