diff --git a/webui/html/index.html b/webui/html/index.html
index ff8b87c..7dbadea 100644
--- a/webui/html/index.html
+++ b/webui/html/index.html
@@ -381,6 +381,24 @@
       .sidebar .navLabel { display: none; }
       .sidebar .tab { justify-content: center; }
     }
+    .file-folder-row{
+      display:flex;
+      align-items:center;
+      justify-content:space-between;
+      gap:10px;
+      cursor:pointer;
+      user-select:none;
+    }
+
+    .file-folder-left{
+      display:flex;
+      align-items:center;
+      gap:10px;
+    }
+
+    .file-folder-files{
+      margin-left: 18px;
+    }
   </style>
 </head>
 
@@ -861,6 +879,15 @@
     localStorage.setItem('pod_group_collapsed:' + pod, v ? '1' : '0');
   }
 
+  function _isFolderCollapsed(folderKey) {
+    return localStorage.getItem('files_folder_collapsed:' + folderKey) !== '0'; 
+    // default collapsed = true
+  }
+
+  function _setFolderCollapsed(folderKey, v) {
+    localStorage.setItem('files_folder_collapsed:' + folderKey, v ? '1' : '0');
+  }
+
   function renderActionsDropdown(menuId, actionFn, targetEsc) {
     // actionFn is string: "containerAction" of "podAction"
     // targetEsc is al esc(...) dus veilig in onclick
@@ -1382,15 +1409,20 @@
       const apiFolderPath = (folder.path || '').replace(/^\/+/, '');
       const uiFolderPath = filesToUiPath(apiFolderPath);   // zonder systemd/
       const folderLabel = uiFolderPath || 'root';
+      const folderKey = apiFolderPath; // unieke key (met systemd/..)
+      const collapsed = _isFolderCollapsed(folderKey);
 
       parts.push(`
-        <div class="mono" style="margin:8px 0 6px 0; font-weight:600; display:flex; align-items:center; justify-content:space-between; gap:10px;">
-          <span>📂 ${esc(folderLabel)}</span>
-          <span class="flex">
+        <div class="mono file-folder-row" data-folder="${esc(folderKey)}" style="margin:8px 0 6px 0; font-weight:600;">
+          <span class="file-folder-left">
+            <span class="folder-toggle">${collapsed ? '▶' : '▼'}</span>
+            <span>📂 ${esc(folderLabel)}</span>
+          </span>
+          <span class="flex" onclick="event.stopPropagation();">
             <button class="btn small ok" title="Nieuw bestand in ${esc(folderLabel)}" onclick="filesNewFileInFolder('${esc(uiFolderPath)}')">+</button>
             <button class="btn small bad" title="Verwijder map (alleen als leeg)" onclick="filesDeleteFolder('${esc(uiFolderPath)}')">🗑️</button>
           </span>
-       </div>
+        </div>
       `);
 
       const files = folder.files || [];
@@ -1399,17 +1431,37 @@
         continue;
       }
 
+      parts.push(`<div class="file-folder-files" data-folder-files="${esc(folderKey)}" style="${collapsed ? 'display:none;' : ''}">`);
+
       for (const f of files) {
         const fullUi = uiFolderPath ? `${uiFolderPath}/${f}` : f;
         parts.push(`
-          <div style="display:flex;align-items:center;justify-content:space-between;gap:10px;margin-left:10px;padding:4px 0;border-bottom:1px dashed rgba(36,52,95,.35)">
+          <div style="display:flex;align-items:center;justify-content:space-between;gap:10px;padding:4px 0;border-bottom:1px dashed rgba(36,52,95,.35)">
             <span class="mono" style="cursor:pointer" onclick="filesOpen('${esc(fullUi)}')">📄 ${esc(f)}</span>
           </div>
         `);
       }
+
+      parts.push(`</div>`);
     }
 
     treeEl.innerHTML = parts.join('');
+    treeEl.onclick = (ev) => {
+      const row = ev.target.closest('.file-folder-row');
+      if (!row) return;
+
+      const folderKey = row.getAttribute('data-folder');
+      const isNowCollapsed = !_isFolderCollapsed(folderKey);
+      _setFolderCollapsed(folderKey, isNowCollapsed);
+
+      // pijltje updaten
+      const arrow = row.querySelector('.folder-toggle');
+      if (arrow) arrow.textContent = isNowCollapsed ? '▶' : '▼';
+
+      // files block tonen/verbergen
+      const filesBlock = treeEl.querySelector(`[data-folder-files="${CSS.escape(folderKey)}"]`);
+      if (filesBlock) filesBlock.style.display = isNowCollapsed ? 'none' : '';
+    };
   }
 
   async function filesOpen(uiPath) {