I have a grid with posts on my WordPress website. Id like to have some of the featured thumbnails on my wordpress site as looped videos instead of only images. Do I need to create a custom acf field for that and is there a way to integrate that inte the thumbnail loop?
I think you are looking for something else. ACF cannot let you use a video as a featured image. Featured image is a WP feature, not an ACF feature.
Maybe try this https://wordpress.stackexchange.com/questions/251007/how-to-replace-the-wordpress-featured-image-with-a-video
