The following command creates a multipart upload in the bucket ``my-bucket`` with the key ``multipart/01``::

  aws s3api create-multipart-upload --bucket my-bucket --key 'multipart/01'

Output::

  {
      "Bucket": "my-bucket",
      "UploadId": "dfRtDYU0WWCCcH43C3WFbkRONycyCpTJJvxu2i5GYkZljF.Yxwh6XG7WfS2vC4to6HiV6Yjlx.cph0gtNBtJ8P3URCSbB7rjxI5iEwVDmgaXZOGgkk5nVTW16HOQ5l0R",
      "Key": "multipart/01"
  }

The completed file will be named ``01`` in a folder called ``multipart`` in the bucket ``my-bucket``. Save the upload ID, key and bucket name for use with the ``upload-part`` command.