Sorry, but if the user have the right to send data using input form then you can't prevent sending data from ad-hoc input form. Simply no way!
User can create a file with the same name as a standard input form or can change standard input form. Excel file name is not something unique. Don't spend your time on this idea.
Use data access profiles to restrict access and use audit to monitor user activity.
P.S. Please accept the correct answer!
Bluesky
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