File upload no more working in teacher mode "Invalid Submission Error parsing file - Invalid format" - Follow Up Deployment

index.html

@@ -514,7 +514,10 @@
             };
             
             // Create downloadable file with all security features
-            const blob = new Blob([JSON.stringify(assignmentData, null, 2)], { type: 'application/json' });
+            const blob = new Blob(
+  [JSON.stringify(assignmentData)],     // no pretty-print: fewer chances of stray \r\n
+  { type: 'application/json;charset=utf-8' }   // ✅ explicit
+);
             const url = URL.createObjectURL(blob);
             const a = document.createElement('a');
             a.href = url;