Child Theme CSS Issues

Hi.

I’m customising a child theme in WordPress.
The original theme has two stylesheets in the theme directory, ‘style.css’ and ‘memento.css’.

WordPress is reading its styles from ‘style.css’ correctly but not reading any styles from my modified version of ‘memento.css’.

I’ve added the following code to my child themes version of ‘style.css’ but nothing to the ‘memento.css’ file.

/*
 Theme Name:     Meménto Child Theme
 Theme URI:      https://www.elegantthemes.com/
 Description:    Meménto Child Theme
 Author:         Elegant Themes
 Author URI:     https://www.elegantthemes.com
 Template:       memento
 Version:        1.0.0
*/