I have previously imported some pictures into the Photos app - however I found the files had become corrupt. Now I have gone back to the original source and used a more reliable drive to import them from. They now seem to not be corrupt.
Now I want to import them into the Photos app and overwrite the corrupt photos. It recognises that some have already been imported, meaning if I import all it will create duplicates which isn't what I want.
What is best to do?