docs: protected void processTusFile(File file, String fieldName, String assemblyUrl) throws IOException {
          TusUpload upload = getTusUploadInstance(file);
  
          Map<String, String> metadata = new HashMap<String, String>();
          metadata.put("filename", file.getName());
          metadata.put("assembly_url", assemblyUrl);
          metadata.put("fieldname", fieldName);
  
          upload.setMetadata(metadata);
  
          uploads.add(upload);
      }