Original code for playlist:
<iframe width="560" height="315" src="https://www.youtube.com/embed/videoseries?si=Nbn92ZJu0cgzG-4q&list=PLAktzCwY3LvJ_leIz7AHLZZx1qGJ0-gKD" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
Where to add this to allow auto-play?
&autoplay=1