Use CompleteMultipartUpload with an Amazon SDK or CLI

The following command completes a multipart upload for the key multipart/01 in the bucket my-bucket:

aws s3api complete-multipart-upload --multipart-upload file://mpustruct --bucket my-bucket --key 'multipart/01' --upload-id dfRtDYU0WWCCcH43C3WFbkRONycyCpTJJvxu2i5GYkZljF.Yxwh6XG7WfS2vC4to6HiV6Yjlx.cph0gtNBtJ8P3URCSbB7rjxI5iEwVDmgaXZOGgkk5nVTW16HOQ5l0R

The upload ID required by this command is output by create-multipart-upload and can also be retrieved with list-multipart-uploads.

The multipart upload option in the above command takes a JSON structure that describes the parts of the multipart upload that should be reassembled into the complete file. In this example, the file:// prefix is used to load the JSON structure from a file in the local folder named mpustruct.

mpustruct:

{
  "Parts": [
    {
      "ETag": "e868e0f4719e394144ef36531ee6824c",
      "PartNumber": 1
    },
    {
      "ETag": "6bb2b12753d66fe86da4998aa33fffb0",
      "PartNumber": 2
    },
    {
      "ETag": "d0a0112e841abec9c9ec83406f0159c8",
      "PartNumber": 3
    }
  ]
}

The ETag value for each part is upload is output each time you upload a part using the upload-part command and can also be retrieved by calling list-parts or calculated by taking the MD5 checksum of each part.

Output:

{
    "ETag": "\"3944a9f7a4faab7f78788ff6210f63f0-3\"",
    "Bucket": "my-bucket",
    "Location": "https://my-bucket.s3.amazonaws.com/multipart%2F01",
    "Key": "multipart/01"
}

    let _complete_multipart_upload_res = client
        .complete_multipart_upload()
        .bucket(&bucket_name)
        .key(&key)
        .multipart_upload(completed_multipart_upload)
        .upload_id(upload_id)
        .send()
        .await
        .unwrap();