You would need to configure your domain name on Cloudflare then configure your B2 bucket to use said domain name. With the Cloudflare proxy enabled, you would essentially be using your bucket as a CDN. Please note Cloudflare has a 100 MB upload limit and 512 MB download limit, which can be limiting depending on how you plan to use your bucket. This is also a general indication, not related whatsoever to S3Drive.
