I think we have gotten confused here.
From within the WD TV User Interface, you should be able to move the files from your computer to the external drive connected by USB to the WD TV. However, you have to have the folder on the computer, that you want to copy from, set up as a share. That includes making sure that it has all the permissions set up that will be required to do this.
However, you cannot do the copying from the computer to the external drive connected to the WD TV Live. That’s problematic at least. If you’re trying to do that, then that’s why you’re having problems. You must do the file transfer from either the computer to the external drive if it’s connected directly to the computer; or from the WD TV Live by way of the computer’s shared folder to the external drive connected to the WD TV Live.
