Initially, I had a problem with creating a site within filezilla as I needed to use a private key to login to the server but there was no option listed for logging in with a keyfile. As per this answer I was able to add a keyfile but noticed that the site that I created originally hadn't been saved. When I went to create another site, I figured that I just needed to use "normal" as the authentication type, but after selecting "ok", the type changed to "ask for password" for some reason.
The problem is that I don't have the keyfile associated with that site, even though the keyfile is stored in the system so when I log back in, it still asks me for my password. Given that I'm having to retroactively add the keyfile, how can I associate the keyfile with each site that I create?