Thanks John, unfortunately that didn’t do the trick.
Thanks for your help John,
Unfortunately I haven’t had success as yet with my implementation, am I on the right track here?
function my_acf_format_value( $value, $post_id, $field ) {
$value = str_replace("http://testsite.com.au", "https://d2rfrrfrfr1.cloudfront.net", $value);
return $value;
}
add_filter('acf/format_value/type=file', 'my_acf_format_value', 10, 3);