Use an icon or altenative text on file-url

I use a file-upload-field. No problem.
When I display the record, I use the shortcode [pdb_single template="single-value" fields="het_rapport"]. It shows a complete URL + text as long as the filename.

I tried to make a new template-page for the single-value-url and use echo $this->field->raw_value() in the template, to make a link like ‘Download here’, but it doesn’t show anything.

$this->field->print_value() puts the complete url (<a href….).

How can I make my own link + text (or a button) to download?