What about high-res media? Encountered any issues with playback?

My dude, what year are you living in, and can I join you there?

I use snapdrop/pairdrop for quick and easy file transfers, but I found transfers to be quite slow, so this may be an alternative for larger files.

If you don’t want to run a DNS server and don’t want to set up different internal & external IPs you can also use NAT Hairpinning

Yeah, and even the .su (Soviet Union) domain still exists. There is no way that a TLD as popular as .io will not remain active.