Once you get Plex setup you can have all your videos, photos, and music with you wherever you are. You can stream via the Plex app on the firestick, Chromecast to any supported device with the help of your phone, or download media for offline viewing from your phone via a USB to HDMI adapter. The firestick Plex app is basically just a client, but the Plex app on an nvidia shield can additionally act as a server whose library resides on a USB drive connected directly to the shield or any samba/windows share the shield can see on your network.