Cornerstone Forms ACF
Utilizing and changing ACF data in a form has never been so easy.
ACF has a number of different actions.
The field update actions all utilize the same action internally. The difference is how the ID Selector control works. For a standard Post field update you can use the Post ID. For every other update action there is a special prefix or Key to use here. Let's dig in.
ACF Post Field Update
This action will update a post field. These are fields that show up in the admin post editor.

ACF Term Field Update
The term update uses the format of slug underscore id. So if you had a term with the slug category and you wanted to change the category of id 4 then the ID Selector would be category_4.
The default for the prefab uses is {{dc:term:slug}}_{{dc:term:id}}. Meaning the current term page you are looking at will be used to update.

ACF Option Field Update
The option field action will update an option field. These are fields that show up in your admin dashboard area typically on a certain option field page.

ACF User Field Update
The user update uses the format of user underscore user_id. So if you wanted to change the user with ID 4 you would set the ID Selector to user_4.
The default for the prefab uses is user_{{dc:user:id}}. Meaning the current logged in users custom fields will be updated.

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