You cannot edit an approved Creative on a running Campaign, but you can add new ones.
This is a great choice if you’d like to A/B test your creatives and optimize whichever one seems to capture more clicks. You can pause or resume the creative you are using for the campaign at any time, but must have at least one active creative per campaign available.
Please note any new creatives added will go through the Creative Review Process which will take up to 3 business days.
You can manage the creatives on a campaign by entering the creative section under Campaigns, and pressing the edit button.