Updating media not firing observer job when updating

[dan-lutd]

Not sure but when the post is updated only with media change it doesn't fire the observer.
Do I need to observe the Media model also?

  $post = Post::withTrashed()->find($this->postId);
  if ($post->hasMedia('news-featured')){
    $mediaItems = $post->refresh()->getMedia('news-featured');
    if (! empty($mediaItems) ) {
        $postImageUrl = $mediaItems[0]->getFullUrl(); //url including domain
        if ($postImageUrl != '' ) {
            $query = $this->queryWithImageUrl($postImageUrl);           
        } else {
            $query = queryWithImageUrl();
        }
    }
}

[dan-lutd]

I used a custom Model for Media and set up an observer for that model.
I can fire my job when there are updates, adds and deletes
the observer passes the $media and I can extract the needed information