The tenant encryption scheme must be set in the 5_tempfs.json configuration file. To configure the encryption, execute the following command from a command line interface, with [path to 5_tempfs.json] replaced with the path to the 5_tempfs.json file and MyTenantNameHere replaced with the name of the tenant:
TempFileService.Configuration.exe security set-tenant-scheme --json-config "[path to 5_tempfs.json]" --tenant MyTenantNameHere