Ignore "already imported" when importing
I had previously imported 6000 photos to Photos that were stored on an external drive. The photos were not consolidated - meaning the actual files were only located on the external drive, the Photos app only had a link to their location.
Then the external drive died. This was expected, and I have other copies of the 6000 photos. So I removed the 6000 photos from the Photos app, and tried to import them from the new location.
Guess what? Photos is rejecting all 6000 photos because they were "already imported".
What can I do? Is there any way to tell Photos to import the photos even though it thinks they were already imported. (I know this is the opposite problem most people are having with already imported photos.)