Question about your ftp service

I have a question, regarding your ftp service. Lets say, I have a DNS zone, whose management is delegated to some external DNS hosting provider - and If my domain is pointed at those external name servers, can I use your ftp service, or my domain must be pointed at your name servers, in order to use it.

Thank you in advance.

FTP access is active if your account is active. It doesn’t matter which nameservers you use or whether the website is hosted here at all.

Thank you for your quick response.