title: How to get Amazon s3 url after upload
body: <p>In my users model filepicker_url is set to <code>https://www.filepicker.io/api/file/e7v43btpRbWG8zfj1xxx</code></p>
  
  <p>But I would like to just reference the file directly from Amazon s3. How do I get the Amazon s3 url? </p>
  
  <p>Looking for something more like <code>https://&lt;bucket-name&gt;.s3.amazonaws.com/&lt;key&gt;</code></p>