About VSFTPD FTP server

For setting root directory path

https://askubuntu.com/questions/741164/how-to-change-vsftpds-default-directory-to-instead-of-the-users-home-directo

Running as FTP server with local user credential

https://askubuntu.com/questions/413677/vsftpd-530-login-incorrect

Allow write to folder

https://www.digitalocean.com/community/questions/set-up-vsftpd-but-now-i-m-getting-550-permission-denied-error