Help Using Mailchimp Embedded Forms

I use Mailchimp Embedded forms on my Webflow website. However, if a user is already a Mailchimp subscriber and submits another form, their information is not updated.

I need to be able to update subscribers with a tag or field update if they complete multiple forms (Sign up for a demo, Download an eBook, etc.). What is the best way to accomplish this?

This thread should help Is there a way to update MailChimp fields of a person's old record?