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  • Hi,

    I am also interested in automatically generate thumbnail
    I put this piece of code in functions.php but it does not work when I record Article
    Maybe it’s because I’m in the admin?
    1 / How to build this miniature that is either front-end or back office?
    2 / Is optimizable by optimization plugin (weight / height of the image)?
    Or is it possible to provide an image for the thumbnail?

    function my_acf_save_post( $post_id ) {
        // get new value
     //   $value = get_field('my_field');
      $image = get_field('image', $post_id, false);  //image est ACF field
      $image = intval($image); // make sure it's an int
      set_post_thumbnail($post_id, $image);
    // run after ACF saves the $_POST['acf'] data
    add_action('acf/save_post', 'my_acf_save_post', 20);