Whenever you add a file in your specified Dropbox folder, this applet will automatically download that file to your QNAP Device
If
New file in your folder
This Trigger fires every time any file is saved in the folder you specify. NOTE: will process up to 15 files per polling period.
Then
Download file from URL
This action will download a file from a given URL to your NAS at a path which you specify.
Explore more great ways to automate QNAP and Dropbox