docs: public List<MultipartFile> validateFiles(List<MultipartFile> files, long maxLength, String[] allowExtName) {
  
          List<MultipartFile> retFiles = new ArrayList<MultipartFile>();
  
          for (MultipartFile multipartFile : files) {
  
              try {
  
                  this.validateFile(multipartFile, maxLength, allowExtName);
                  retFiles.add(multipartFile);
  
              } catch (Exception e) {
  
                  LOG.warn(e.toString());
              }
          }
  
          return retFiles;
      }