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Enable custom post type WordPress preview. Source:
//adds custom post type query var to preview links
function mycptname_cpt_previow_query_vars($link, $post) {
$custom_post_types = array('artist');
if(in_array($post->post_type, $custom_post_types)) {
return add_query_arg(['post_type' => $post->post_type], $link);
return $link;
add_filter('preview_post_link', 'mycptname_cpt_previow_query_vars', 10, 2);
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