Hi!
I have tested this on my project. Everything works. I will write as I did so that you can compare.
1. Created a field Group of fields for the required post type (in my case for posts)
2. Edited the post, filled in the data in the subfields
3. In the template for the post added the code
<? php $video = get_field('video_section');
var_dump($video); ?>
4. Go to the post page and see this
array(3) { ["video_link"]=> string(18) "https://my-link.com" ["video_header"]=> string(5) "Title" ["video_subheader"]=> string(8) "Subtitle" }
What are you doing differently?
