partNumber

Part number that identifies the part. This is a positive integer between 1 and 10,000.

• General purpose buckets - In CompleteMultipartUpload, when a additional checksum (including x-amz-checksum-crc32, x-amz-checksum-crc32c, x-amz-checksum-sha1, or x-amz-checksum-sha256) is applied to each part, the PartNumber must start at 1 and the part numbers must be consecutive. Otherwise, Amazon S3 generates an HTTP 400 Bad Request status code and an InvalidPartOrder error code.

• Directory buckets - In CompleteMultipartUpload, the PartNumber must start at 1 and the part numbers must be consecutive.