Slide delay timer

How do you add the delay between slides, I have selected the 4 second option but it is not sticking to the prezi it just does the automatic

Currently, the viewer has to manually click the auto play button. I’d like the Prezi to save so the 4 second auto play starts automatically after a viewer clicks the play button. I am not using the Prezi for a presentation that I am giving but as an advertising tool on my website and social media for people to view.