code: public Observable<ServiceResponse<Image>> addImageFileInputWithServiceResponseAsync(String listId, byte[] imageStream, AddImageFileInputOptionalParameter addImageFileInputOptionalParameter) {
          if (this.client.baseUrl() == null) {
              throw new IllegalArgumentException("Parameter this.client.baseUrl() is required and cannot be null.");
          }
          if (listId == null) {
              throw new IllegalArgumentException("Parameter listId is required and cannot be null.");
          }
          if (imageStream == null) {
              throw new IllegalArgumentException("Parameter imageStream is required and cannot be null.");
          }
          final Integer tag = addImageFileInputOptionalParameter != null ? addImageFileInputOptionalParameter.tag() : null;
          final String label = addImageFileInputOptionalParameter != null ? addImageFileInputOptionalParameter.label() : null;
  
          return addImageFileInputWithServiceResponseAsync(listId, imageStream, tag, label);
      }
docs: Add an image to the list with list Id equal to list Id passed.
  
  @param listId List Id of the image list.
  @param imageStream The image file.
  @param addImageFileInputOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Image object