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  • yes the code is – works with custom post types too:

    <?php
     
    function acf_set_featured_image( $value, $post_id, $field  ){
        
        if($value != ''){
    	    //Add the value which is the image ID to the _thumbnail_id meta data for the current post
    	    add_post_meta($post_id, '_thumbnail_id', $value);
        }
     
        return $value;
    }
    
    // acf/update_value/name={$field_name} - filter for a specific field based on it's name
    add_filter('acf/update_value/name=cursusfoto', 'acf_set_featured_image', 10, 3);
     
    ?>