PHP.ini missing from Valet Site

I have multiple sites being served by Valet. I'm trying to get PHPStorm to offer debugging on one particular site. The mystery is that Storm offers debugging on one of the other sites, but not the other. When I check into the non-performing site, I see that php.ini is empty!

So - do I need an ini file for each site, or does Valet use one ini file for all sites? In which case should I just copy and paste the .ini file into the non-performing site? The non-performing site renders perfectly in a browser. And phpinfo shows xdebug is installed for that site.

Love PHPStorm, but it is always a major pain getting xdebug to work. Thanks!