templateUrl

The URL of a file that contains the template body. The URL must point to a template (maximum size: 1 MB) that is located in an Amazon S3 bucket or a Systems Manager document. The location for an Amazon S3 bucket must start with https://. S3 static website URLs are not supported.

Conditional: You must specify only one of the following parameters: TemplateBody or TemplateURL—or set UsePreviousTemplate to true.