Yeah, that's great at finding
the duplicates. But I think the OP already knows what the dups are, and has a lot of them and wants to merge the duplicate sets in one fell swoop, instead of set by set.
Alas, I haven't found a way to do that
What I have done on accasion is run Find Duplicates, use 'date:today' on the result, and delete all results that match, leaving the already existing copy of the duplicate set.
That gets rid of the duplicates, but doesnt merge
them, which is what the OP wants.