Point a room at a video, share the link, watch in sync.
Token stays on this server and is never sent to viewers. Find yours: support.plex.tv. The app server must be able to reach your Plex server (same LAN, or via its remote / plex.direct URL).
Direct-play works for browser-friendly files (H.264/AAC .mp4 is safest). MKV / HEVC / AC3 may not play in a browser — see the README for the transcode option.
Share the file publicly in Nextcloud and append /download to the
link. The server proxies it, so viewers never see your Nextcloud address and seeking works.
Build a playlist, then create one room. It advances to the next item — for everyone in sync — when one ends or someone hits Next.