saving acf properties when WP runs auto save

This is something I’ve seem discussions on but have no definitive answer on.
Can someone confirm if this is possible or not?

I have a custom post type with a huge number of properties and its vital that users can safe as frequently as possible. Right now, as most of the fields are required, if they quit out of the initial posting before a successful completion of the majority of fields, even though an auto save lists the post all it contains is the standard wordpress title field upon editing it again.

I thought maybe a plugin or something in my functions.php was causing this so I installed the latest WP fresh with ACF and found its standard behavior.

Can someone please assist as im desperate to get this working.