I have a hub connected to HMS but it’s downstairs. Can I add an alarm for upstairs?
Not with another hub.
However, you can set up a rule to have cameras set off a siren when there is an alarm and have camera sirens silenced when you disarm the alarm. That is what I do. I just have a few cameras in different locations that match the HMS siren, and then I can have sirens anywhere I want them. Works pretty well IMO.
What about the pre alarm trigger sound like the countdown?
That is a little more difficult since the cameras don’t have a beeping noise to match, only a siren. However, I sometimes use an Alexa Echo speaker and have it make a sound for the entry delay beeping or exit delay beeping, but this is a lot more complicated to setup and takes some technical workarounds. For the most part, my general answer is that there is no easy way to do that right now.
Wow, that’s unfortunate.