Preview Solution! 10 years later

• Ivan D.

• August 28, 2023 at 11:24 am

TL;DR Syntaxe update on the still working solution.

10 years later I still have the same problem with the preview (not related to ACF here but to with the WP featured image).

I gave a solution in this forum thread Preview solution !

I cannot post a reply in the original thread because it’s closed but I wanted to keep a track of the updated code solution for me (or anyone) in the future that will loose their mind debugging the WP preview.

You can se the problem in this old image

The code in the previous thread is still working but needs a little update on the syntaxe.

So here is the solution updated (put this code on your function.php file):

`
/*
Debug preview with custom fields
*/

add_filter(‘_wp_post_revision_fields’, function($fields){
$fields[“debug_preview”] = “debug_preview”;
return $fields;
});

add_action(‘edit_form_after_title’, function () {
echo ‘<input type=”hidden” name=”debug_preview” value=”debug_preview”>’;
});
`