Question How do we change references with the new Timeline? Also, how can we swap Assets?

So I want to use Timeline to make some Actions/Consequences type of play.

My player is generated at runtime, which is why I need to know how to get the GameObject for it and put it in the Timeline.

Second? I want to have a scene that plays a clip, stops and the game waits for the player to make a decision.

Depending on yes/no/whatever, there's a clip for it. A different animation will play.

Basically?

[Player enters tavern, sits on a table.]
->Play [EnterTavern]

Eats Food

-> Play [EatFood]
​

Drink Beer

-> Play [DrinkBeer]​

Speak with Barman

-> Play [SpeakWithBarman]​

Player is done.
-> Play [Outro]

You could do that in Unity 2019. What happened? Why can't I do it in 2021.3?

Google and these forums are useless, because every single solution I seem to find are for the old Timeline.
And I can't find it in the Documentation either.