Problem: A CRED form is used to publish custom posts and includes a custom image field. The client would like this image to also be assigned as the featured image when the form is submitted.
Solution: You can use the cred_save_data hook to run a snippet of code when the form submits which will set the _thumbnail_id post meta with the ID of the media post created by the custom image field. Example code is shown below: https://toolset.com/forums/topic/affect-an-image-field-as-featured-image-for-a-product/#post-513008
Relevant Documentation: https://toolset.com/documentation/programmer-reference/cred-api/#csd
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