update

app.py

@@ -263,7 +263,7 @@ def completed(username):
 def send_visualization(filename):
     logger.info(f"Attempting to serve file: {filename}")
     # Ensure the path is safe and doesn't allow access to files outside the intended directory
-    safe_path = safe_join(os.getcwd(), filename)
+    safe_path = os.path.join(os.getcwd(), filename)
     directory = os.path.dirname(safe_path)
     file_name = os.path.basename(safe_path)
     logger.info(f"Serving file from directory: {directory}, filename: {file_name}")