Reply To: Update Gallery Field

• John Huebner

• February 11, 2022 at 11:49 am

Are you using media_sideload_image() to import the image to the media folder? It is not clear that this is the case. The image most be in the DB to add it to an ACF field.

A gallery field holds an array of attachment IDs.

// return array of current image IDs
$gallery = get_field($selector, $post_id, false);
if (!$gallery) {
  $gallery = array();
}
$gallery[] = $new_attachment_id;
update_field($selector, $gallery, $post_id);