If you have openssh-server already install then you already have SFTP and don't need to add anything for file transfer. As a bonus, SFTP is secure, unlike FTP:
If you are looking to share access to some folders, you will have to set the appropriate group permissions.
Code:
sudo addgroup webmasters
sudo chgrp -R webmasters /var/www
sudo find /var/www -type d -exec chmod g=rwxs "{}" \;
sudo find /var/www -type f -exec chmod g=rws "{}" \;
sudo gpasswd --add hoube78 webmasters
sudo gpasswd --add colleague1 webmasters
sudo gpasswd --add colleague2 webmasters
# etc.
Once the permissions are set, then you can leave them.
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