Excellent post. I wanted to generate thumb images for photos uploaded to s3 bucket using aws Lambda, could successfully implement it.<p>but found one issue, that many here might not be aware of, S3 bucket and Lambda function should be in same aws region.<p>Unfortunately, my s3 bucket is in southeast-ap, and aws lambda is not available in this region. couldn't go live today. will have to copy bucket to another region to use it.<p>hope this helps. thanks.