How to connect a Cloudflare subdomain to AWS Amplify?

We have been struggling with getting a subdomain routed to an Amplify serverless site on AWS.
Has anyone done this? Youtube and Google have nothing on it!

AWS Amplify uses a cloud front address that I can put in a CNAME record. but this simply redirects without keeping my domain in the address bar.

We already validated the domain using a custom temporary CNAME post.

Any help would be greatly appreciated!