Encountering unexpected errors when uploading a created SSL certificate to object storage for a static site

I am attempting to follow the guide at https://www.linode.com/docs/guides/host-static-site-object-storage/; I have run into issues where the documentation no longer helps me get through making a static site available under an apex domain.

I already have the desired domain managed through Linode.
I have created an object storage bucket, uploaded the artifacts I want, and can visit them at the http://[bucket].website-[cluster].linodeobjects.com host. I have also created a CNAME record that points to the website bucket and verified that I can curl the site content from the CNAME record's host. Next, I am attempting to follow the https://www.linode.com/docs/products/storage/object-storage/guides/custom-domain/ guide to register a custom domain using a letsencrypt cert so that I can visit the domain using HTTPS.

I was able to successfully generate a certificate via certbot but when I attempted to upload it to the bucket under the "SSL/TLS" tab, I get the following error message:

Certificate is not valid for the bucket name. Verify the bucket name is covered by the SANs and/or CN.

This question has been asked before, but I can't find any steps to resolve this.
Any help would be appreciated!