A bucket is a tape that has delegated writes to the gateway. Refer to it by its lowercase label, which
tape create and tape info print. The S3 pages share one set of placeholders: https://s3.example.com for the endpoint, TAPE4Q7ZK2M9XH3PD8AW and its secret for the credential, my-bucket for the bucket, solana for the region. The gateway ignores the region, so any label works.