A snapshot output can be added using the `add-output` action. The
output destination URL is set using either the 'URL' positional
argument, or both the option:--ctrl-url and option:--data-url options.
A snapshot output can be added using the `add-output` action. The
output destination URL is set using either the 'URL' positional
argument, or both the option:--ctrl-url and option:--data-url options.