Files not moved to completed folder

I've set my downloading folder to external hdd and completed folder to same hdd, but when file has finished downloading correct folder is created in completed folder, but files are not moved.
This works fine if I use internal memory. Being developer myself I can't see why file move is not possible if app already have write access on external hdd.
I've also tried zetaTorrent app and it can download to external hdd and move files around in same hdd after download without a problem, but your app surpasses it in all other aspects.