GForm create GSheets easy but i need to see/update GSheets data in a webform

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I have a doubt about the spreadsheet tutorial from puravidaapps

hello @Taifun, I read a tutorial from puravidaapps but i haven't delivered it. The tutorial is this: https://puravidaapps.com/spreadsheet.php#source when i see the Page source, i don't find listitem or the questions keys. I have done an app that really created a response when i seen it on google forms, but all responses was "left empty" What can i do