Can pdf name be unique like this example

Unique names
uses the mPDF PHP class:
you want your pdf filenames to be unique, add this filter to your my_template.php file:

function custom_pdf_filename($pdf_filename) {
$pdf_filename = 'my_template-' . FrmProEntriesController::get_field_value_shortcode(array('field_id' => x, 'entry_id' => 'entry')) . '.pdf';
return $pdf_filename;}
add_filter('mpdf_output_pdf_filename', 'custom_pdf_filename');

wanting to know if I can add a function to do the same so that when a client downloads the form entry that it has it’s own name and not overriding the last downloaded form.
Thanks.