the document is not getting uploaded

index.html

@@ -79,17 +79,21 @@
             const sendBtn = document.getElementById('send-btn');
             const fileUpload = document.getElementById('file-upload');
             const fileName = document.getElementById('file-name');
-            
-            fileUpload.addEventListener('change', function(e) {
-                    if (e.target.files.length > 0) {
-                        fileName.textContent = e.target.files[0].name;
-                        await processDocument(e.target.files[0]);
-                        addMessage('bot', 'Document uploaded! You can now ask questions about it.');
-                    }
-});
-            
-            sendBtn.addEventListener('click', sendMessage);
-            userInput.addEventListener('keypress', function(e) {
+            fileUpload.addEventListener('change', async function(e) {
+                if (e.target.files.length > 0) {
+                    fileName.textContent = e.target.files[0].name;
+                    await processDocument(e.target.files[0]);
+                    addMessage('bot', 'Document uploaded! You can now ask questions about it.');
+                }
+            });
+            sendBtn.addEventListener('click', function() {
+                if (!documentContent) {
+                    addMessage('bot', 'Please upload a document first.');
+                    return;
+                }
+                sendMessage();
+            });
+userInput.addEventListener('keypress', function(e) {
                 if (e.key === 'Enter') sendMessage();
             });