Allow Webp, SVG, ICO

function allow_additional_mime_types($mime_types) {

    $mime_types['svg'] = 'image/svg+xml';

    $mime_types['webp'] = 'image/webp';

    $mime_types['ico'] = 'image/vnd.microsoft.icon';

    return $mime_types;

}

add_filter('upload_mimes', 'allow_additional_mime_types');