Zyxel stopped publishing/supporting their NAS Starter Utility, so when I needed to access some files on it, I had to find a new way to locate the NAS on the network.
The easiest way for me was to go to the router's web site and look at the list of attached devices and their ip addresses.
Then from there I could map a network drive with \\192.168.1.XX\Volume1
and put in the correct credentials and get access to the data.
Also additional networking settings were needed from Windows features.