I'd like to access custom ACF field values from custom_preview() filter?

add_filter( 'preview_post_link', 'custom_preview' );

function custom_preview() {
    // how to access ACF field values here ?

As documented, the preview_post_link passes the post object as the second parameter. You can use this to get any fields that you might want:

    function( $preview_link, $post ) {
        $custom_field = get_field( 'custom_field_name', $post );
        return $preview_link;
    2 // MUST be 2 to get the $post parameter.
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