public function template_description()
{
?>
<div class="carbon-description {{{ value ? '' : 'hidden' }}}">
<div class="carbon-attachment-preview {{{ thumb_url ? '' : 'hidden' }}}">
<img src="{{ thumb_url }}" class="thumbnail-image" />
<div class="carbon-file-remove dashicons-before dashicons-no-alt"></div>
</div>
<div class="carbon-attachment-file-name">{{ file_name }}</div>
</div>
<?php
}