How can I watch a movie in sync with my brother in the same home?

We have:

What do we do now if we want to stream a movie file to the two headsets and have the headsets in SYNC so they play at the same movie position?

I saw an old 2018 thread where @Pumel and @Andy seems to say that this is possible, but I don't understand?

The main SkyBox website also says something about it? It's possible? How??

If synced devices is possible, does it support pause, rewind/fast-forward and will the movie position stay synced on all devices?

AirScreen previously supported streaming a movie file to two headsets, but now the latest version no longer has this feature.

We plan to add support for multiplayer mode(watching videos with friends) in the future. Your patience is much appreciated.