Build rich layouts and data structure with Strapi Dynamic Zones

Hi there,
First, thanks for this great article. It was very helpful.
I have a question which I am pretty sure it will be easy to answer.
When I connect and use the API via Postman, the dynamic zone content is not coming, it is not part of the json response. I already tried to add ?populate=* to the end of the URL and that allowed me to see the Meta Tags and the Rich Text content, however not the slider. What am I missing here? Many thanks.