Thanks for your suggestions again but they are not working for me.
As for your question about the kind of edits: I cropped and made adjustments to the photos I am trying to revert to original.
In order to check what you mention, now I have tried the following:
- In an original photo (not edited) I edit it with cropping, filter and adjustments and click done.
- I quit photos
- I open photos again and click on edit that photo. I see revert to original is available.
- I click on revert and photo comes back to original.
Therefore, my conclusion is that "revert to original" works with all cropping, filter and adjustments, but somehow it is not working with the photos I edited a few days ago.
On the other hand, the photo library is not shared.