docs: private File saveAsFile(ResponseBody responseBody) {
      if (responseBody == null) {
        return null;
      }
  
      try {
        File file = new File(destDirectory + File.separator + fileName + retrieveUniqueId() + "." + extension);
        InputStream inputStream = null;
        OutputStream outputStream = null;
  
        try {
          inputStream = responseBody.byteStream();
          outputStream = new FileOutputStream(file);
          byte[] buffer = new byte[4096];
          int numOfBufferedBytes;
  
          while ((numOfBufferedBytes = inputStream.read(buffer)) != END_OF_FILE_DENOTER) {
            outputStream.write(buffer, 0, numOfBufferedBytes);
          }
  
          outputStream.flush();
          return file;
  
        } catch (IOException exception) {
          return null;
  
        } catch (Exception exception) {
          return null;
  
        } finally {
          if (inputStream != null) {
            inputStream.close();
          }
  
          if (outputStream != null) {
            outputStream.close();
          }
        }
  
      } catch (IOException exception) {
        return null;
      }
    }