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Form data not being sent with redirect URL in place on Success

I have a form set up on a site. It was working correctly but then I set it up so that when someone submits the form, they get redirected to a 3rd party page once the form has been submitted. Now, the person gets redirected after clicking submit but the data from the form on my site doesn’t come across to the backend/doesn’t get emailed to the client. Is there a setting I’m missing somewhere to make it so that the form data still gets emailed like normal but once the submission is successful they are redirected?

Here is my site Read-Only: