How do I Update Capella App Services?

I can’t believe I have to ask this, but: how do you upgrade Capella App Services to a new version?

I want to upgrade Couchbase Server to 8.x and App Services (Sync Gateway) to 4.x, but I cannot find anywhere to do this in the Capella web UI. The release notes tell me to “contact support” but, hilariously, I’m forbidden from filing a support ticket because we pay only ~$500/mo.

I’m a bit frustrated. I’ve come to Couchbase from MongoDB where upgrading was a dead-simple, one-click operation. It feels like this is needlessly difficult.

What magic incantation must I perform to have the upgrades applied?

Ah, I discovered that if I select “none of the above” as the first option in the “file a support ticket” flow (as opposed to selecting the cluster in question), I can actually submit a ticket. I’ve done that now.