title: How to access an attachment in a chat message
body: <p>Is there a ressource that would let me access an attachment in a google hangouts chat, I can see the url to get a preview, for instance :
  <a href="https://chat.google.com/downloads?attachment_token=TOKEN&amp;content_type=image%2Fpng" rel="nofollow noreferrer">https://chat.google.com/downloads?attachment_token=TOKEN&amp;content_type=image%2Fpng</a></p>
  
  <p>But I failed to find in the rest api reference anything relevant, I thought it would have been in the message get : <a href="https://developers.google.com/hangouts/chat/reference/rest/v1/spaces.messages/get" rel="nofollow noreferrer">https://developers.google.com/hangouts/chat/reference/rest/v1/spaces.messages/get</a></p>