A creative contains the contents of the ad. ie. The text, images, colors etc. that will be served to the end user.A creative is part of an ad (which is combination of a placement and template).
Media Validation
Although aspect ratio constraints can be added to image fields when creating the template. We found that it can become messy (Eg. when images are a couple of pixels outside of a certain aspect ratio).Due to this, we don't enforce a hard validation on uploaded media. However, when requesting an ad, the decision engine will return a media URL conforming to the constraints of the template field.Eg: An image template field has a constraint of 1:1, but a 16:9 image is uploaded via the ad manager platform. We will accept this but the decision engine will return the media in 1:1 format, cropping the image from the center.
