Hi Paulo,
Have you set the Host input starting with ftp:// ?

I was able to use it successfully on Personal environment.
On one occasion, working on an Enterprise license, a VPN was needed to reach the FTP server and I add to ask OutSystems to set up a VPN according to the requirements from the infrastructure team of the FTP server. I requested a VPN directly on Lifetime (more detail here).
Hope it helps.
Cheers,
João