to my understanding, currently there is a problem for the SmartWare software to identify a WD cloud drive that is not directly connected to the next router. If the drive is connected to the second router below/behind the first one, it is not possible für the SW to detect the drive although it works fine for all other purposes. Probably it would be helpful to have a dialog box / option in the SW where you could enter the destination IP address. That would solve the issue.
The router set-up is a common set-up for people using TV cable internet connections.