Make sure to create a proper file-like object for the Body parameter

[paulrigor]

Ref: https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3/client/put_object.html
Body (bytes or seekable file-like object) – Object data

ExaGO/cdk-projects/s3lambda/lambda/lambda_handler.py

Line 29 in 91ff4e2

Body=exago_output, Bucket=output_bucket, Key=output_file_key)