diff --git a/app/static/js/upload.js b/app/static/js/upload.js
index 3337282..a8927d1 100644
--- a/app/static/js/upload.js
+++ b/app/static/js/upload.js
@@ -472,7 +472,7 @@ document.addEventListener('DOMContentLoaded', function () {
     }
 
     // File upload functionality
-    const uploadButton = document.getElementById('upload-button');
+    const uploadButton = document.getElementById('select-files-btn');
     const uploadModal = document.querySelector('.upload-modal');
 
     // Hide upload modal by default if it exists
@@ -482,29 +482,32 @@ document.addEventListener('DOMContentLoaded', function () {
         uploadModal.style.visibility = 'hidden';
     }
 
-    // Setup upload button
+    // Setup upload button with proper existence checks
     if (uploadButton && fileInput) {
-        uploadButton.addEventListener('click', function () {
+        uploadButton.addEventListener('click', function (e) {
+            e.preventDefault(); // Prevent default button behavior
             fileInput.click();
         });
 
         fileInput.addEventListener('change', function () {
-            if (this.files.length > 0) {
+            if (this.files && this.files.length > 0) {
                 // Handle file upload
                 handleFileUpload(this.files);
             }
         });
     }
 
-    // Close upload modal when close button is clicked
+    // Close upload modal when close button is clicked - with existence check
     const closeButtons = document.querySelectorAll('.upload-modal .close-btn, .upload-modal .modal-close');
-    closeButtons.forEach(btn => {
-        btn.addEventListener('click', function () {
-            if (uploadModal) {
-                uploadModal.classList.remove('active');
-            }
+    if (closeButtons.length > 0) {
+        closeButtons.forEach(btn => {
+            btn.addEventListener('click', function () {
+                if (uploadModal) {
+                    uploadModal.classList.remove('active');
+                }
+            });
         });
-    });
+    }
 
     // Handle file upload process
     function handleFileUpload(files) {