What you’re trying to do is possible.
When including php files, use get_stylesheet_directory() in child themes and get_template_directory() in parent themes.
E.g.
require_once( get_stylesheet_directory() . '/inc/myfile.php');
get_stylesheet_directory_uri() and get_template_directory_uri() will return URLs. Those functions are useful when enqueuing public assets such as stylesheets and JavaScript.
Also, setting allow_url_include to Off in your php.ini will provide better error reporting in these situations (source).
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