Your SHIELD TV device can add Network Addressable Storage (NAS) devices. This can be useful if you have a large amount of personal media shared on a network you would like to access on your SHIELD TV (e.g., PLEX Media Server)
To add a NAS,
Under Settings
> Device
> Storage & reset,
select "Network storage."
Any network discoverable drives will be located under "Available Network Storage."
If your NAS is hidden or does not broadcast, you can select "manually add a network storage."