Test: OS map with code embed plugin

Testing OS map (Dartmoor) inserted here using the Code Embed plugin shortcode i.e. the URL of the html file with ‘%’ before and after. The html file was created with OS web map builder (using old OS API as key).
Works on laptop.
Does it work on mobile? Yes, but loads very slowly, and search box not working.
%https://www.mapsta.net/wordpress/wp-content/uploads/2019/11/OSDartmoorMap.html%