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I've tested it on my end and I can see that the Google Drive and Google Spreadsheet integration is working properly. I've cloned your form and integrate it with Google Drive. I did a test submission and the form submission is showing in the Google Drive folder.
If it is still not working, please try to re-integrate the Google Drive to your form. Please take note that it will create a new folder if you redo the integration.
Hope that works. Thank you.
It started working again for me as well. For some reason it was down for about an hour or so, and no responses were being sent to Google Drive. It's working now - thanks for the help anyway!