Heard about his on the self hosted podcast and just installed it and it works great.
Dont use the given compose file just make your own with the linuxserver image. Here's mine and it works over tailscale and through my reverse proxy.
I use a fork of it.
Pairdrop.
There i can easily configure my own stun/turns-server.
If i use turns over port 443, it's even possible, to use pairdrop from a device into a vpn to s device outside...
The dnapdrop-app for android also works with pairdrop.