Deleting duplicate files in Zotero storage folder

Hi,
I recently upgraded my storage capacity to move from the linked file to the stored file system (in order to annotate PDF on iOS). In the process, when I did "convert linked files to stored files," I mistakenly did not check the box delete the orginal file because I wanted to keep a backup in case something went wrong (I should have backed up my linked file folder instead, that was stupid). Now I have double copies of all stored files for every item. Since I have over 5000 items, I can't possibly manually delete all the redundant files. So instead of taking 6Gb, my stored file library now takes up 12Gb of storage space.

How can I delete the duplicate files when the two are identical? (in some case, I had on purpose more than one attached file to an item, when I keep multiple versions of an article or an appendix file separately from the main article, etc.)

From what I see, each of two (or more) copies of the PDFs is stored in a separate folder in the Zotero file architecture. I tried to use the Attachment Scanner plugin, first scanning the whole library, then turning on the "delete attachment linked to the same file" function and running it on my whole database. The process completed, but it didn't delete the double entries.

Please help!
Thanks in advance!

Maxime

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