Hi RichardU,
FTP in to your unraid server is possible but I would not recommend it.
Not sure about your requirement and systems, but I use windows and connect via a SSH client (Mobaxterm) and there is plenty of other clients for both win and mac (FileZilla is an SSH client as well, have tried it a few times, but find it bloated).
When I want to edit files directly I have setup an SHH client in VS Code and can edit the files directly.
You should have SSH enabled by default, if not, it is easy to enable it reading the manual.
That's all you have to do if you are working on your local network, if you need remote access just setup WireGuard and use a VPN to connect to your network and work the same as above.
A VPN is way more secure than FTP and both involves opening up ports to the world!
Hope it helps,
Kru-x