What is wrong with this shortcode? to include external php file in WordPress posts

Look at below function

function LoadNavigationFile($atts)
{ 
  if ( ! empty( $atts['dirname_with_file'] ) ) {
     $dirname_with_file = $atts['dirname_with_file'];
  }

  $str=include( get_template_directory() . $dirname_with_file );   

}

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