since version 28 nextcloud do not want trailing slash on directory

path...

templates/leads/lead_documents.html

@@ -2,7 +2,7 @@
 {% load i18n %}
 
 {% for directory, docs in documents %}
-    <h2 class="row mt-2"><a href='{{ lead_doc_url}}/{{ directory }}/'>{{ directory }}</a></h2>
+    <h2 class="row mt-2"><a href='{{ lead_doc_url}}/{{ directory }}'>{{ directory }}</a></h2>
     <ul>
     {% for doc, url in docs %}
         <li><a href="{{ url }}">{{ doc }}</a></li>