Hi Sally,
That is perfect. Try adding this code to the functions.php file in your theme/child theme directory – make sure to have a full server back-up first for safety. For more details you can check the safe coding guidelines.
add_filter('asp_results', 'asp_my_custom_link_url', 10, 1);
function asp_my_custom_link_url($results) {
foreach ( $results as $k => &$r ) {
if ( $r->content_type == 'attachment' ) {
$r->link = get_post_meta( $r->id, '_gallery_link_url', true );
}
}
return $results;
}