title: Trello API add base64 data image as an attachement
body: <p>I'd like to send base64 image as an attachment to a trello card through the API</p>
  
  <pre><code>POST /1/cards/[card id or shortlink]/attachments
  </code></pre>
  
  <p>There's a <strong>file</strong> field but it does not specify how should look the data there.</p>
  
  <p>Refs: <a href="https://developers.trello.com/advanced-reference/card#post-1-cards-card-id-or-shortlink-attachments" rel="nofollow noreferrer">https://developers.trello.com/advanced-reference/card#post-1-cards-card-id-or-shortlink-attachments</a></p>
  
  <p>Any idea?</p>