docs: public final java.io.File downloadFile(String filePath) throws TelegramApiException {
          if(filePath == null || filePath.isEmpty()){
              throw new TelegramApiException("Parameter file can not be null");
          }
          String url = File.getFileUrl(getBotToken(), filePath);
          String tempFileName = Long.toString(System.currentTimeMillis());
          return downloadToTemporaryFileWrappingExceptions(url, tempFileName);
      }