title: Using an existing S3 bucket in AWS SAM template
body: <p>I am using AWS SAM template for deployment of python AWS lambdas. The trigger for these functions are from existing S3 buckets. But in SAM template I am unable to use existing buckets (only new bucket creation is supported), hence I'am creating the trigger manually.</p>
  
  <p>Is there any way we could incorporate this in SAM template ?</p>