Collect data from multi page/step non-HubSpot website forms

Apparently "HubSpot at this time does not support multi page form submission in its native form tool" (see https://community.hubspot.com/t5/Conversion-Tools/Multiple-GravityForms-but-only-getting-login-field...), so only the first page of non-HubSpot forms are logged when one activates the "Collect data from website forms" setting.

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