После кнопки Просмотр в product-list.tpl

{if $product.attachments}
{foreach from=$product.attachments item=attachment name=attachments}
<a class="button" href="/{$link->getPageLink('attachment.php', true)}?id_attachment={$attachment.id_attachment}" title="{$attachment.description|escape:'htmlall':'UTF-8'}">{$attachment.name|escape:'htmlall':'UTF-8'}</a>
{/foreach}
{/if}