diff --git a/api/dropbox-proxy.js b/api/dropbox-proxy.js
index d61bb01..e623118 100644
--- a/api/dropbox-proxy.js
+++ b/api/dropbox-proxy.js
@@ -1,28 +1,16 @@
-import fetch from 'node:fetch';
-
-const DROPBOX_APP_KEY = process.env.DROPBOX_APP_KEY;
-const DROPBOX_APP_SECRET = process.env.DROPBOX_APP_SECRET;
-const DROPBOX_REFRESH_TOKEN = process.env.DROPBOX_REFRESH_TOKEN;
-
-async function getAccessToken() {
-  const response = await fetch('https://api.dropboxapi.com/oauth2/token', {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-    body: `grant_type=refresh_token&refresh_token=${DROPBOX_REFRESH_TOKEN}&client_id=${DROPBOX_APP_KEY}&client_secret=${DROPBOX_APP_SECRET}`
-  });
-  const data = await response.json();
-  return data.access_token;
-}
+const DROPBOX_ACCESS_TOKEN = process.env.DROPBOX_ACCESS_TOKEN;
 
 export default async function handler(req, res) {
-  const accessToken = await getAccessToken();
-  
+  if (!DROPBOX_ACCESS_TOKEN) {
+    return res.status(500).json({ error: 'DROPBOX_ACCESS_TOKEN not configured' });
+  }
+
   if (req.method === 'GET' && req.query.info === '1') {
     try {
       const fileInfo = await fetch('https://api.dropboxapi.com/2/files/get_metadata', {
         method: 'POST',
         headers: {
-          'Authorization': `Bearer ${accessToken}`,
+          'Authorization': `Bearer ${DROPBOX_ACCESS_TOKEN}`,
           'Content-Type': 'application/json'
         },
         body: JSON.stringify({ path: '/Data-Matrix.xlsx' })
@@ -42,18 +30,24 @@ export default async function handler(req, res) {
     const upstream = await fetch('https://content.dropboxapi.com/2/files/download', {
       method: 'POST',
       headers: {
-        'Authorization': `Bearer ${accessToken}`,
+        'Authorization': `Bearer ${DROPBOX_ACCESS_TOKEN}`,
         'Dropbox-API-Arg': JSON.stringify({ path: '/Data-Matrix.xlsx' })
       }
     });
-    
+
+    if (!upstream.ok) {
+      const errText = await upstream.text();
+      console.error('Dropbox API error:', upstream.status, errText);
+      return res.status(upstream.status).send('Dropbox error: ' + errText);
+    }
+
     const buffer = await upstream.arrayBuffer();
-    
+
     res.setHeader('Content-Type', 'application/octet-stream');
     res.setHeader('Cache-Control', 'no-store');
     res.send(Buffer.from(buffer));
   } catch (err) {
-    console.error('Dropbox error:', err);
+    console.error('Dropbox proxy error:', err);
     res.status(500).send('Proxy error: ' + err.message);
   }
 }