code: def put_file(buffer, modified_file):
      
      import mimetypes
      import boto3
      file_type, _ = mimetypes.guess_type(modified_file)
  
      s3 = boto3.resource('s3')
      bucket_name, object_key = _parse_s3_file(modified_file)
      extra_args = {
          'ACL': 'public-read',
          'ContentType': file_type
      }
      bucket = s3.Bucket(bucket_name)
      logger.info("Uploading {0} to {1}".format(object_key, bucket_name))
      bucket.upload_fileobj(buffer, object_key, ExtraArgs=extra_args)
docs: write the buffer to modified_file.
  
      modified_file should be in the format 's3://bucketname/path/to/file.txt'