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Tapota Sarudza Mutauro The flexible ad format is designed to help you automatically optimize your ad format to show people what we predict they’re most likely to respond to based on the specific placement and audience. When you select Flexible as your ad format, you can select up to 10 images and videos in a single ad campaign, and the ad delivery system will automatically determine what media or media combination, such as single image, video or carousel, to show to people.