Captions
No captions loaded. Use an .srt or .vtt file that matches the film.
When you share an app, its own subtitles come through with the picture. In VLC, use Subtitle, then Add Subtitle File. For captions that friends can switch off, use "Play a film file" instead.
What are we watching?
Share an app, a browser tab or your whole screen. On Windows, pick "Entire screen" and tick "Share system audio" so friends hear it. Playing a film file? Select its .srt caption file at the same time to add captions.
Waiting for the film
You're in. The picture appears here as soon as the host presses play.