Populate select inputs with CMS data.
Your select input and the CMS that provides the data has to be in the same div block and be sibling elements.
This allows you to have multiple CMS select input instances without needing to change the attribute each time.
Add this attribute to the Select input element.
1. To have multiple CMS select inputs, you duplicate your existing elements and change the source of the CMS. No extra attributes needed.
Add this attribute to the Collection List Wrapper element not on the Collection List
Add this attribute to the Text Block that is connected to the CMS field .