diff --git a/neode-ui/docker/nginx-demo.conf b/neode-ui/docker/nginx-demo.conf
index 8266efff..30b6b146 100644
--- a/neode-ui/docker/nginx-demo.conf
+++ b/neode-ui/docker/nginx-demo.conf
@@ -61,10 +61,12 @@ http {
 
         # Proxy FileBrowser API to mock backend (demo mode)
         location /app/filebrowser/ {
+            client_max_body_size 10G;
             proxy_pass http://neode-backend:5959;
             proxy_http_version 1.1;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
+            proxy_request_buffering off;
         }
 
         # Serve AIUI SPA
diff --git a/neode-ui/mock-backend.js b/neode-ui/mock-backend.js
index 8f43b970..3fc52e58 100755
--- a/neode-ui/mock-backend.js
+++ b/neode-ui/mock-backend.js
@@ -1367,6 +1367,22 @@ app.get('/app/filebrowser/api/resources', (req, res) => {
   })
 })
 
+// FileBrowser upload (POST to resources path) — mock accepts and discards the body
+app.post('/app/filebrowser/api/resources/*', (req, res) => {
+  req.resume()
+  req.on('end', () => res.sendStatus(200))
+})
+
+// FileBrowser delete
+app.delete('/app/filebrowser/api/resources/*', (req, res) => {
+  res.sendStatus(200)
+})
+
+// FileBrowser rename
+app.patch('/app/filebrowser/api/resources/*', (req, res) => {
+  res.sendStatus(200)
+})
+
 // FileBrowser raw file content (for text file reading)
 app.get('/app/filebrowser/api/raw/*', (req, res) => {
   const reqPath = '/' + decodeURIComponent(req.params[0] || '')