EngineStates do not allow you to specify System Priority.

[Erin M Gunn]

The system 'add' functions in EngineState do not allow the System priority to be specified.

https://github.com/nadako/Ash-Haxe/blob/master/src/ash/fsm/EngineStateMachine.hx

[Timur]

When you do state.addInstance() you get link to StateSystemMapping object, it has withPriority() method to specify priority for the system.

So you can do

state.addInstance(new PhysicSystem()).withPriority(1)
     .addInstance(new CameraSystem()).withPriority(2)
     .addInstance(new PreUpdateSystem()).withPriority(0);

[Erin M Gunn]

Ah yes. Thank you. I'll just close this and walk away like nothing happened...

[Timur]

Don't forget to close other related issues!