Trying to find a way to update information on existing rows via a form (not via update request)

Hello Smartsheet Community. I have a customer who has uploaded an existing excel spreadsheet into Smartsheet (about 200 rows) which includes information such as email address, first name, last name, etc. as columns. We have created a form to capture new information to each row. Is there a way to set it up so that the new information goes to their existing line? And update request does not work because the form has logics and drop downs which I cannot mimic in an update request.

Thanks for any help :)

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