docs: @Nonnull
    @ReturnsMutableCopy
    public ICommonsOrderedMap <String, UserDataObject> confirmUploadedFiles (@Nullable final String... aFieldNames)
    {
      final ICommonsOrderedMap <String, UserDataObject> ret = new CommonsLinkedHashMap <> ();
      if (aFieldNames != null)
      {
        m_aRWLock.writeLocked ( () -> {
          for (final String sFieldName : aFieldNames)
          {
            // Remove an eventually existing old UDO
            final TemporaryUserDataObject aUDO = m_aMap.remove (sFieldName);
            if (aUDO != null)
            {
              LOGGER.info ("Confirmed uploaded file " + aUDO);
              // Convert from temporary to real UDO
              ret.put (sFieldName, new UserDataObject (aUDO.getPath ()));
            }
          }
        });
      }
      return ret;
    }