In the past we showed how to create a custom query for showing ACF Pro's Gallery field or Meta Box' Advanced Images fields' images in Bricks slider element here.
It is possible to achieve the same result in a simpler way using the bricks/posts/query_vars filter. This Pro tutorial shows how.
ACF
Step 1
Create a field group attached to your desired post type having a Gallery-type of custom field.
Step 2
Edit your Pages and populate the field.
Step 3
Edit your post type's singular template with Bricks.
Add a Slider (Nestable) element.
Delete Slides 2 and 3.
Select Slide 1 and enable query loop.
Click the loop icon and set Post type to Media.
Step 4
Add the following in child theme's functions.php or a code snippets plugin:
