Let me know how it goes, or frustrations. I admit that currently it is not the most friendly UX. And found out a bug that if no direct P2P possible, it fails to fallback to the STUN-ish data relay. However LAN mode and WAN via direct P2P works on latest releases.
https://keibidrop.com/ repo: https://github.com/KeibiSoft/KeibiDrop