diff --git a/templates/helper.twig b/templates/helper.twig
index 5304c3ac..b411f195 100644
--- a/templates/helper.twig
+++ b/templates/helper.twig
@@ -13,7 +13,7 @@
         <a target="_blank" data-no-ajax rel="noopener" href="{{ attachment|entityURL('file_view') }}">
         {% endif %}
             {% if attachment.picture %}
-                <img class="hoverpic" src="{{ attachment|entityURL('file_view') }}">
+                <img class="hoverpic" data-thumbnail="{{ attachment|entityURL('file_view') }}" src="{{ attachment|entityURL('file_view') }}">
             {% else %}
                 <i class="text-dark {{ class }} {{ ext_to_fa_icon(attachment.extension) }}"></i>
             {% endif %}
@@ -21,7 +21,7 @@
         </a>
         {% endif %}
     {% elseif not attachment_helper.fileExisting(attachment) %}
-        <i class="{{ class }} fa-exclamation-triangle text-danger"></i>
+        <i class="{{ class }} fa-exclamation-triangle text-danger" title="{% trans %}attachment.file_not_found{% endtrans %}"></i>
     {% endif %}
 {% endmacro %}