CSS 404s

I made a test page with wordpress and Amelia Lite, and the event CSS 404s (e.g. https://s-qybscdlfwfdql.eu1.wpsandbox.org/elementor-105)

Page just states that https://s-qybscdlfwfdql.eu1.wpsandbox.org/wp-content/plugins/ameliabooking/public/css/frontend/amelia-booking-1-0-69.css?ver=1.0.69 can’t be found