The start function will play the animation of your case. You will need to follow and click on the dotted green action circle to move forward with the process animation logic. An attachment will open if there is any in the animation process.
Navigate to the "Play" panel and click on the Start function to start the animation of your case.
A new window will open where you will be able to interact with your animation; play, stop it and follow the logic of your case by clicking on the dotted green action circle. On the left side, you will also see an animation trace to be able to follow the cases which have been completed.