Sometimes it’s necessary to have two FTP users on a domain with access to the httpdocs and/or subdirectories, which Plesk doesn’t allow by default.
# Create a web user in Plesk
# Change the default directory to the required one and the userid to
the same as the main FTP user
grep ftpuser1 /etc/passwd
usermod -u 1234 -o -d /var/www/vhosts/domain.com/httpdocs/directory ftpuser2