The reason why I ended up with this is hard to explain but basically, I have the same 400gb torrent, which was partially downloaded at about 40%, twice:
/FolderA/400gb torrent at 40%
/FolderB/400gb torrent at 40%
Now, if I could merge both folders together, I would probably have 60% of the torrent downloaded, saving a few Gb in download.
Is there a way to merge them ? So that I don't have to resume one of the 2 downloads and loose the data gathered from the other one ?