Cannot stop/pause audio tracks in UMG animations

Users cannot stop/pause audio tracks in UMG animations. The sound track cannot be manipulated using the animation nodes given in UMG

1. Download the attached project
2. Play in editor
3. Press the play button
4. Try and click the button labeled stop function
5. Try and click the button labeled pause function
6. Notice that the sound does not stop when either function is called

Expected: The sound track would be able to manipulated using the functions provided for animations in UMG
Result: The sound track cannot be manipulated using the animation nodes given in UMG