@borg357 Sorry, I've never used FTP on Recalbox, I use WinSCP or I transfer over the network via file explorer.
The documentation specifies that you can use Cyberduck for SFTP connections:

https://recalbox.gitbook.io/documentation/v/francais/tutoriels/systeme/acces/acces-sftp-ssh-via-cyberduck-macos-win

See if these threads help you, they mention the use of FTP (if you use the forum search system, you will find even more mentions of FTP that can help you):

https://forum.recalbox.com/topic/24266/jeux-ports-avec-la-7-2-1/15 https://forum.recalbox.com/topic/23811/xbox-series-s-x-controller-not-pairing-with-recalbox-7-1/3