Thanks for the question! Unfortunately, I don't have clear documentation on hand about the specific steps for re-importing an enhanced CSV to update existing records in DecileHub.

I'd recommend reaching out directly to the Decile Hub support team so they can walk you through the best approach for your situation. You can also try posting this in the support channel if you haven't already, and a team member should be able to get you the right answer quickly.

Sorry I can't be more specific here!