I sent out a form and a couple of the respondents want to change their responses but this is what they see and no way forward. I have the setting to allow users to edit their responses turned on.
The respondent needs to click the 'Save and edit later' button after submitting the answer. If they miss it, they won't be able to change their answer again, even if they refresh the page.
Click "Submit" button to submit the response.
In Thank You page, click "Save and edit later" button, form taker will be prompted to sign in.
After sign in, form taker will be redirected to Forms portal and see a Form Card shown under Recent tab.
Click the card, the response form will be opened, and click "Edit response" button to edit and resubmit the response.
