Images attached to advert post type does not get deleted after the post deletion

Theme Used- Twenty Fifteen
Plugin Version- 1.0.11
Issue – I created an ad and tried to delete the ad permanently. The media attached to the post was not getting deleted. I am afraid if the post expires and post will be deleted but all media attached will remain in library. I don’t know It’s a defect or theme conflict.

After using the following snippet this is working fine.
function delete_associated_media($id) {
//check if product
if (‘advert’ !== get_post_type($id)) return;

$media = get_children(array(
‘post_parent’ => $id,
‘post_type’ => ‘attachment’
));

//if no media associated with
if(empty($media)) return;

foreach ($media as $file) {
//pick what you want to do
wp_delete_attachment($file->ID);
}
}

//used action hook “before_delete_post”
add_action(‘before_delete_post’, ‘delete_associated_media’);