BeginMultipartUploadResponse

{
  "file": FileDetails,
  "uploadId": String,
  "uploadParts": {
    "count": Integer,
    "first": UploadPart
  }
}

{
  "file": {
    "accountId": "YOUR_ACCOUNT_ID",
    "etag": "33a64df551425fcc55e4d42a148795d9f25f89d4",
    "filePath": "/uploads/image.jpg",
    "fileUrl": "https://upcdn.io/A623uY2/raw/uploads/image.jpg",
    "lastModified": 1615680311115,
    "metadata": {
      "myCustomField1": true,
      "myCustomField2": {
        "hello": "world"
      },
      "anotherCustomField": 42
    },
    "mime": "image/jpeg",
    "originalFileName": "example.jpg",
    "size": 43182,
    "tags": [
      "example_tag"
    ]
  },
  "uploadId": "Kd759aLFxttm69kZ",
  "uploadParts": {
    "count": 12,
    "first": {
      "range": {
        "inclusiveEnd": 5242879,
        "inclusiveStart": 0
      },
      "uploadId": "Kd759aLFxttm69kZ",
      "uploadPartIndex": 7,
      "uploadUrl": "https://...long-url...x-id=PutObject"
    }
  }
}