How can I send 50gb+ file over internet to friend?

Hello,

I'm trying to send something to my gf's friend (~50gb)

I tried creating my own torrent and was able to dl it on another device, but on her machine it stayed at 0% and wouldn't let me connect to seed

Is FTP a good option? I set up a proxmox server last night but I don't really know what I'm doing yet

Any guidance greatly appreciated, thanks.