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Videos are automatically resized to fit the format. Images in overlay can be resized manually and be placed anywhere on the video. While images in the companion need to meet format's specs. See 4 - Ad Formats for more.
How many stories can I add for each Ad format?
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What are the available formats I can use?
Here a complete list of all the formats we support.
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In what file can the Ad Formats be exported to?
Created ad formats can be exported to the standard VAST, VMAP, MRAID IAB.