title: Get selected values from message menu or drop-down on click of a button in a slack interactive message or attachment
body: <p>I have a slack message with two actions:</p>
  
  <ol>
  <li>Message Menu, i.e. dropdown</li>
  <li>Button</li>
  </ol>
  
  <hr>
  
  <p>I would like to:</p>
  
  <ol>
  <li>Select a value from the message menu or drop-down.</li>
  <li>Click the button.</li>
  <li>On clicking this button, I would like to get the value of the selected value from the drop-down</li>
  </ol>
  
  <hr>
  
  <p>Please let me know if it is possible.</p>