I recently used an image importer that has duplicated all the images. They are attached to the right posts and the posts are fine (not duplicated).
How do I run through my media library deleting duplicate images?
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The best way (if the duplicated images are the ones attached) is to order by date, and bulk delete all the older ones.
I know its too late for this answer, but can help others, you can use Media Deduper plugin to index and find duplicated image , it is also good enough to link the post to existing image.