title: How to do downloadable file in response from the bot
body: <p>Hello there :)</p>
  
  <p>Challenge Skype; Bot Framework; receive downloadable files</p>
  
  <p>I have an issue. My project is to ask something to the bot (using Bot Framework Emulator currently but later I will use Skype) and the bot answers with an attached image/chart.
  I can display through the interface the answer and the image. However, the user cannot download this image.</p>
  
  <p>How can I do that ?
  There is an option in an AdaptiveCard message to be able to download the attached image thanks to a Button ?</p>
  
  <p>I tried with HeroCard, ThumbnailCard, AdaptiveCard and a simple attachment but it did not solve my problem.</p>
  
  <p>Thanks in advance :)</p>