Camera photos won't upload to iCloud in Catalina
I finally got around to uploading my large Photos library to iCloud
When finished photos had a folder called "Unable to Upload"
I have plenty of space in iCloud (90 of 200gb used).
The pictures are the oldest in my library, they are jpegs and they were imported into iPhoto at the time from a digital camera. When required I transferred from iPhoto to Photos
In the "Unable to Upload" folder the very oldest pictures are just blank rectangles. In the photos library they are there.
How do I upload those pictures to iCloud?
I m running Catalina 10.15.7
MacBook Pro 15″, macOS 10.15