About form submission timestamps
When you connect a Studio.Design form to Google Sheets, sending the submission timestamp directly to the linked spreadsheet isn't currently supported.
However, you can get the submission timestamp by downloading your form data as a CSV file.
Note: Editing and managing the linked spreadsheet
Don't edit the first sheet where responses are recorded. Editing it may prevent responses from being saved.
Don't use a colon (":") in your spreadsheet name, as it will cause an error.