Subscription does not update into AppSync

Hi,

I followed the `provider.ts` file to update my subscription on mutation to the AppSync.
The provider works okay, the subscription string that it generated are looking good too.

However, even though the `startSchemaCreation` process is success and other schema has been updated (eg: new mutation or query), but the Subscription was nowhere to be found in AppSync Schema.

Am I missing something or the old way doesn't work anymore?

This is how it looks like for generated subscription:
`type Subscription {
onCreateEvent(filter: String): Event @aws_subscribe(mutations: ["createEvent"])}`