title: Multiple upload images in active_admin with Active Storage
body: <p>I found useful article about uploading image using Active Storage in activeadmin: <a href="https://medium.com/@maris.cilitis/using-ruby-on-rails-active-storage-image-uploads-for-active-admin-backed-resources-5638a9ca0b46" rel="noreferrer">https://medium.com/@maris.cilitis/using-ruby-on-rails-active-storage-image-uploads-for-active-admin-backed-resources-5638a9ca0b46</a></p>
  
  <p>But how to upload multiple images in activeadmin with Active Storage the same way? </p>