Can I upgrade a Qantas Classic economy redemption (Malaysian Airline aircraft)?

If I purchase an economy Classic Rewards flight on Malaysian Airlines with my Qantas FF points and the flight is of the right category, will I be allowed to bid for an upgrade to Business Class?

Yes, you can change your redemption (costs 6k to change) if there is a business seat (award space) available. Obviously, you have to pay the change fee and the point difference from economy to business.

Best to redeem business outright if you haven’t made the economy redemption.