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Thank you Long, you are a star as always mate - I will give this a try!

Here is some code for future reference for anyone struggling with this 🙂

add_action( 'rwmb_XXXFIELDGROUPIDXXX_after_save_post', 'update_post_title' );

function update_post_title( $post_id ) {
    // Get the field value
    $my_title = rwmb_meta( 'XXXFIELDIDXXX', '', $post_id );
    $my_desc = rwmb_meta( 'XXXFIELDIDXXX', '', $post_id );
    $my_feature = rwmb_meta( 'XXXFIELDIDXXX','', $post_id );
    // Prepare update post
    $my_post = array(
        'ID' => $post_id,
        'post_title' => $my_title,
	'post_excerpt' => $my_desc, 

    );
	
    wp_update_post( $my_post );
	set_post_thumbnail( $post_id, $my_feature['ID'] );
}

When I browse to the post in the back end I do see the image in the field group, but the featured image box in the side bar is empty. So its saving the image to the table but not adding it as the featured image for the custom post.

Thank you Long! You really are a star mate.

I don't have the programming skills to tackle this myself yet but I think as an option on the Image Select field other customers may find it useful as well so hopefully the devs can consider it 🙂

Thanks again!

Hi Ya

Di I put that code into functions.php? Or somewhere else?