code: func (c *StorageGateway) AddUploadBuffer(input *AddUploadBufferInput) (*AddUploadBufferOutput, error) {
  	req, out := c.AddUploadBufferRequest(input)
  	return out, req.Send()
  }
docs: // AddUploadBuffer API operation for AWS Storage Gateway.
  //
  // Configures one or more gateway local disks as upload buffer for a specified
  // gateway. This operation is supported for the stored volume, cached volume
  // and tape gateway types.
  //
  // In the request, you specify the gateway Amazon Resource Name (ARN) to which
  // you want to add upload buffer, and one or more disk IDs that you want to
  // configure as upload buffer.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Storage Gateway's
  // API operation AddUploadBuffer for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/AddUploadBuffer