Amazon Ad Server now offers more prominent default serve settings when configuring ad delivery groups. Find your delivery group, select a primary ad, and determine which image or ad to serve as a default according to your preferred ad rotation method.

For time-based rotations, campaign managers are now required to set a default ad to serve when running in-banner ads with the Ad Server if one is not assigned during a specific time slot.

Visit these Help Center articles to learn more:

• Ad serving rotation methods
• Work with delivery groups