title: How to override Django admin's views?
body: <p>I want to add an upload button to the default Django admin, as shown below:</p>
  
  <p><img src="https://i.stack.imgur.com/ISjYp.png" alt="enter image description here"></p>
  
  <p>To do so I overrode the admin/index.html template to add the button, but how can I override the admin view in order to process it?</p>
  
  <p>What I want to achieve is to display a success message, or the error message, once the file is uploaded.</p>