mutation CreateAttachmentUploadUrl($input: CreateAttachmentUploadUrlInput!) {
  createAttachmentUploadUrl(input: $input) {
    attachmentUploadUrl {
      attachment {
        id
        fileName
        fileSize {
          __typename
        }
        fileExtension
        fileMimeType
        type
      }
      uploadFormUrl
      uploadFormData {
        key
        value
      }
      expiresAt {
        unixTimestamp
        iso8601
      }
    }
    error {
      message
      type
      code
      fields {
        field
        message
        type
      }
    }
  }
}

{
  "input": {
    "customerId": "id",
    "fileName": "string",
    "fileSizeBytes": 1,
    "attachmentType": "EMAIL"
  }
}

{
  "data": {
    "createAttachmentUploadUrl": {
      "attachmentUploadUrl": {
        "attachment": {
          "id": "id",
          "fileName": "string",
          "fileSize": {
            "__typename": "FileSize"
          },
          "fileExtension": "string",
          "fileMimeType": "string",
          "type": "EMAIL"
        },
        "uploadFormUrl": "string",
        "uploadFormData": [
          {
            "key": "string",
            "value": "string"
          }
        ],
        "expiresAt": {
          "unixTimestamp": "string",
          "iso8601": "string"
        }
      },
      "error": {
        "message": "string",
        "type": "VALIDATION",
        "code": "string",
        "fields": [
          {
            "field": "string",
            "message": "string",
            "type": "VALIDATION"
          }
        ]
      }
    }
  }
}