code: @Override
      protected boolean handleMultiPart()
      {
          final boolean ret = super.handleMultiPart();
          try {
              if (isMultiPart() && getRequest() instanceof MultipartServletWebRequest) {
                  for (final Entry<String, List<FileItem>> entry : ((MultipartServletWebRequest) getRequest()).getFiles()
                                  .entrySet()) {
                      int i = -1;
                      if (entry.getValue().size() > 1) {
                          i = 0;
                      }
                      for (final FileItem fileItem : entry.getValue()) {
                          final String key = i > -1 ? entry.getKey() + "_" + i : entry.getKey();
                          final FileParameter parameter = new FileParameter(key, fileItem);
                          Context.getThreadContext().getFileParameters().put(key, parameter);
                          if (i > -1) {
                              i++;
                          }
                      }
                  }
  
                  final Map<String, String[]> parameters = new HashMap<>();
                  final IRequestParameters reqPara = getRequest().getRequestParameters();
                  for (final String name : reqPara.getParameterNames()) {
                      final List<StringValue> values = reqPara.getParameterValues(name);
                      final String[] valArray = new String[values.size()];
                      int i = 0;
                      for (final StringValue value : values) {
                          valArray[i] = value.toString();
                          i++;
                      }
                      parameters.put(name, valArray);
                  }
                  Context.getThreadContext().getParameters().putAll(parameters);
              }
          } catch (final EFapsException e) {
              throw new RestartResponseAtInterceptPageException(new ErrorPage(e));
          }
          return ret;
      }
docs: Handle the multipart to store the files and parameters in the context also.
  @return true if multipart