I've used sendme a few times after coming across Iroh on Bluesky. It's honestly great. Just Works™, very fast, supports files and folders, resumable transfers, one sender to many receivers, and has fast relays as a fallback when a direct connection truly isn't possible, and it will actually tell you whether you have a direct connection or are using a relay (unlike others like Magic Wormhole or Croc from my experience).
Sendme works on the web too (at least, theoretically since iroh released web support recently but not sure they updated this repo specifically, I've sent files using iroh myself on the web).
https://github.com/n0-computer/sendme