A StorageClass defines a class of storage and the provisioner able to create it. The StorageClass YAML Generator writes that manifest from a form so you do not have to recall the storage.k8s.io/v1 schema.
You set the StorageClass name and provisioner, choose a reclaim policy and volume binding mode, optionally allow volume expansion, and add mount options and provisioner parameters. The resulting YAML is valid storage.k8s.io/v1.
The name and provisioner are required and validated. Problems are reported in a clear panel. Everything runs locally and nothing is uploaded.