A CustomCreativeAsset is an association between a CustomCreative and an asset.
            Any assets that are associated with a creative can be inserted into its HTML snippet.
- Namespace
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https://www.google.com/apis/ads/publisher/v202411 
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                            The name by which the associated asset will be referenced. For example, if the value is "foo", then the asset can be inserted into an HTML snippet using the macro: "%%FILE:foo%%".  | 
                  
                        
                           
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                         The asset. This attribute is required. To view the asset, use CreativeAsset.assetUrl.  |