welcome to the forums.
Even if Radio Roku could store information about videos residing on your network drive, how would a SoundBridge ever play them?
Hint: Post this request to the forum related to your Amazon/Netflix Wonderbox-Thingy
(TM alanmc) to learn why it you can't play files that are stored locally.
SoundBridge M1001 and M1000 • Clint L1 (retired) • DNT IP-dio (retired)
Google Chromecast • Amazon Fire TV • Amazon Echo and Echo Dot