Did not work as expected

I downloaded this plugin to use it to remove duplicate media items that had been accidentally created by WP All Import. In our case there were 2 media items (attachments) which referred to a single file. I just wanted to remove the duplicate attachment post and leave the file and one attachment post.

Firstly the index did not find all instances of the issue.

Secondly when I used the smart delete on some instances it removed the files and left media items which were no longer pointing to any file on the server so returned a 404 for the missing media file.

This is certainly not the expected behaviour so I had to revert to my backup.