Major problem with debian console and transfer license key

My clan lost a man who set up our ts3 to cloud. He died. And now i try to transfer new license key to cloud server. Our host provider has no ftp and all must do on debian console. I do not know how to do that.

try scp

https://wiki.archlinux.org/title/SCP_and_SFTP

Yes, i m sure that it the thing but i try , no any progress.

Try Filezilla with sftp, its using the ssh port.
https://wiki.filezilla-project.org/Using