code: def s3(ctx, bucket_name, data_file, region):
      
      if not ctx.data_file:
          ctx.data_file = data_file
  
      if not ctx.bucket_name:
          ctx.bucket_name = bucket_name
  
      if not ctx.region:
          ctx.region = region
  
      ctx.type = 's3'
docs: Use the S3 SWAG backend.