Ad Review creates a gallery of the ad creatives in your apps by intelligently grouping together ad images and highlighting ad details like network and title. You can filter this gallery of creatives by network, title, title category, country, and so forth, within a time frame you choose.
To see your creatives gallery go to MAX > Ad Review > Review > Creatives in your MAX dashboard. Click on an ad in the gallery to see details about the ad such as its creative ID, DSP, and impressions over time.