Trying to create a subdomain and connect it to R2 object storage

I set up a custom domain subdomain in R2 Object Storage and it says Active and Enabled on it but the object storage isn't accessible through it as the DNS isn't resolving, presumably since I haven't actually made the subdomain yet.

The support chat says I need to add a CNAME record for the subdomain but I don't know how to fill it out. The support chat says to point it to my R2 bucket's endpoint but I can't find this info and the pages and sections it says to go to to find it don't exist. Some sources say it's the S3 API but the UI won't accept that in the CNAME record.
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