So,
I have a search ad campaign set up. Apple kindly make the advert for you based on your screenshots and icon etc.
I have just updated my app with a new icon, design and screenshots. Although the release is in the app store, my app campaign ads do not appear to have changed their design to reflect this.
I have tried creating a new campaign to see if it makes the ads with the new design but it seems to be the same.
Does anyone know how to trigger this change or if I just have to wait for the changes to trickle through? If so... how long?
Having checked back occasionally I can report that this took 1 day to update in the control panel. I am still not sure how long this takes to update the ad itself.