I'm not sure what the title should have been?
And I hope I can explain what is missing when saving.

If I import an image into DP19 (and previous versions I think), make changes to the image, and then I normally close that file.
It's at this point you are asked if you want to save the changes.
But, I also used to get an option that asked if I wanted to keep the original or discard the original.

Does anyone know how this option can be turned back on?