Debug Level

Where in the documentation does it describe how to set the debug level in the script file?

Where in the documentation does it describe the various debug levels and what they mean?

daleedom wrote:

Where in the documentation does it describe how to set the debug level in the script file?

See https://winscp.net/eng/docs/faq_script_ini

Where in the documentation does it describe the various debug levels and what they mean?

As mentioned in documentation, you need these, when reporting bugs only.
https://winscp.net/eng/docs/ui_pref_logging