login with sudo -u another (i.e. change to a non-root user)

My WinSCP sessions are running the following executable:
(determined by ps -ef | grep 'ftp')

From a PuTTY session I can change (to a non-root) user with the following command:
I'd like to do that with WinSCP.
Under "Advanced Settings" I configured "SFTP Server" as follows:
I get the following error message:

Cannot initialize SFTP protocol. Is the host running an SFTP server?

Any ideas what I'm doing wrong?

The problem was the -c. This worked:

Thanks for sharing your solution.