@John, If you do not change this, then at least please add a line text explaining this at the "Admin Backup/Transfer" page.
This has caused me a lot of problems, when after a lot of planning and timing, I was going to make a server migration from one da server to another da server, but when the time came, I was not able to make ftp transfer work, and did not understand why. I even sent you a email asking for why it was not working (several years ago). You did not suggest that the reason was because I did not add a domain, and so did not have a ftp account, and was unable to help. I was in a hurry, in the middle of the night doing server migration, and this missing admin ftp account gave me a lot of trouble!
Please understand this causes a lot of confusion. It's caused me a lot of trouble! You should make sure that everybody that install DirectAdmin understand what they need to do in order for ftp for admin user to work, or you should change it so that ftp account is created for admin user automatically. This has not been any fun.
Put information about what is needed on "Admin Backup/Transfer" page or make the ftp account be created automatically. Please. Now, I will just forget it. I don't care anymore, now I know the work around, previous I did not know what was wrong. It is not logically, how are we supposed to know that we need to add a temporary domain for ftp account to work when we need to do server migration using "Admin Backup/Transfer"?