Well, here is an update to the External Editors issue. The one External Editor I use the most is the Luminar Photo Editing App. It is quite versatile and does a good job of editing photos. Luminar has issued an update that fixes the External Editor Save issue. So, what can we learn from this? Apple made changes in the Photos App, but the third party External Editor Apps are responsible to update their applications to continue to work inside of Photos. I am sure Photolemur and other photo editing Apps will make these updates soon, just a FYI for you all.