As much as I'm a fan of these FOSS WebRTC solutions, nothing quite worked for me reliably in a room of people with a variety of devices and technical knowledge.

I use https://fileroom.io/about but it is not FOSS, it does use their own servers for storage (you have to believe they delete the files) and the project looks dead overall.

But this drop.lol thing does not allow "click to browse" and that is rather cumbersome on mobile. Also, users should be able to asign a name?