Set up FTP server on macOS High Sierra (ProFTPD)
I have used pure-ftpd instead of ProFTPD. It is simpler.

After I installed pure-ftpd using brew,

brew install pure-ftpd


I configured the FTP (username-password) setting referring to https://wiki.archlinux.org/index.php/Pure-FTPd

And then start FTP server.

brew services start pure-ftpd