But Plex on the Fire Stick is the main way I stream my local NAS media content.

Works fine for streaming media from a local network DLNA media server. One can install the VLC Player through the Amazon App Store on the Fire Stick. Personally, since purchasing the Fire Stick several years ago, I have the ever popular VLC Player installed on a Fire Stick 4K. Various apps out there that can be installed or side loaded to the Fire Stick to stream from Twonky. Otherwise, as the previous poster indicated use your favorite internet search engine and search for Amazon Fire Stick DLNA media players. My Cloud OS 5: Manage and Configure Plex Media Server One can enable DLNA within Plex if one still needs that feature for certain DLNA network clients. One can then load the Plex client app to the Roku and Fire Sticks to stream their media. If your OS5 My Cloud supports Plex you may want to install and configure the Plex Media Server app through the My Cloud Dashboard App tab for a better user experience rather than using Twonky.

Fire tv stick plex