Update app.py

app.py

@@ -56,7 +56,7 @@ def main():
     
     # Save button
     if st.button('Save Changes'):
-        base_name, extension = selected_file.splitext(selected_file)
+        base_name, extension = selected_file.split(".")
         new_filename = f"{base_name}_modified{extension}"
         doc.save(modified_doc, new_filename)
         st.success('File saved successfully!')