code: @Nonnull
    public FineUploader5Request setFilenameParam (@Nonnull @Nonempty final String sFilenameParam)
    {
      ValueEnforcer.notEmpty (sFilenameParam, "FilenameParam");
      m_sRequestFilenameParam = sFilenameParam;
      return this;
    }
docs: The name of the parameter passed if the original filename has been edited
  or a Blob is being sent.
  
  @param sFilenameParam
  New value. May neither be <code>null</code> nor empty.
  @return this