best video players for mobile?

I am doing an event where around 40 people are going to watch a VR video together. We got some homido snap on lenses for smartphones and we will try to have everyone have the video ready to go on their phones…I am trying to find the very simplest way to do this so those with no tech savy can do it.

Ideally it’d be great if there was an app that downloaded 360 videos from a URL and played them once downloaded. I think 40 people all streaming a 4k youtube video would be a disaster, obviously, but that would be the simplest. I wish youtube let you download 360 videos!

Does anyone know of any app that does this? Or have any other ideas for how to get 40 people all watching the same vid on their phone at once?

Thanks for any advice!!!