Spreadsheet, google form, scan not direct send

initially i used only the 'scan&submit previous' button first, it scan the qrcode and suppose to direct submit the scanned name, but it only submit it if i click it again and scan another qrcode.
so i added the second button 'submit last scan' so that the last name that scanned be submit and empty the label.
can anyone help me on the code so that i can just use 1 button.

The result of a scan is never immediately available after the scan request.

thanks, it work.

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