OK, I was able to register a variable and set a value ("ON").
However I can't use it in another flow since a trigger thing always requires an action thing.
This is what I want to do:
Push a Stringify button to enable/disable multiple flows.
The flow looks like this:
Function(variable) is ON -> AND motion sensor registers motion -> THEN start recording on multiple Arlo cameras etc.
The problem is that I can't seem to combine 2 triggers (variable & motion).