What Is Blueprint Notify?

I realized “Blueprint Notify” in Animation State but I don’t know what is this. Firstly I created “UAnimNotify” blueprint but this is not showing in “Blueprint Notify” popup. Can you explain what is this?

Also checked documentation for this but nothing found.

It’s similar to the “event” curve in timelines. It tells your blueprint that a specific time is reached, so it can perform a task, e.g. spawn dust when the character lands.

Ok. But how can I use it? I tried several ways but not working. Also there is no any information for this.