Yeah, all of that Siri stuff you're trying isn't there yet.
18.1 (the current beta) has minor improvements to Siri for immediate follow up requests and parsing requests where you stumble over words. 18.2 is supposed to be picking up ChatGPT integration so Siri can ask it about things. The "personal context" recall is apparently in 18.4, so we won't see it until next year.
Honestly, 18.1 launching the new Siri UI (the glowy look) feels like a bad idea -- I'd have kept it until 18.4 when the real intelligence improvements actually land.
https://www.macrumors.com/2024/09/22/apple-intelligence-feat...