title: Access Slack files from a slack bot
body: <p>I need a slack bot that's able to receive and save files send from slack chatrooms.</p>
  
  <p>The problem is: slack doesn't send file contents, but an array of links pointing to the file. Most of them, including download link are private and cannot be accessed via bot. It does send one public link, but that link points at the file preview, which does not have the file itself (<a href="https://slack-files.com/T0JU09BGC-F0UD6SJ21-a762ad74d3" rel="noreferrer">here's an example</a>).</p>
  
  <p>So the question is: how can I access uploaded files via bot?</p>