" * The scene heading for each new scene document has already been filled in for you with “ACT [N]” and “SCENE [N]”. You can leave this as-is - Scrivener will automatically insert the correct act and scene numbers during the compile process."
When I compile my screenplay, this miracle doesn’t happen to me - there are the act and scene numbers missing, replaced with [N]. I have the latest Scrivener (3.3.6).