wp_get_attachment_url returns http not https

the function wp_get_attachment_url returns http instead of https if cloudflare https is enabled. This causes a mix-content warning in the browser for some of the assets (using for instance unyson plugin) to solve that you could add the following filter:

add_filter(‘wp_get_attachment_url’, function($url) {
return set_url_scheme($url, ‘https’);
}, 999);