There’s already an existing suggestion to integrate the functionality of ExportTools into PMS. Please comment/vote in that thread in order to avoid distracting votes.
Therefore I’ll close this thread as a duplicate.
As for the issue at hand: as D_eight6 pointed out… filtering for duplicates and double-checking your collections are your friends (e.g. because the number displayed in Plex is not the number of files but the number of visible items).
