presets palette - not working or not understanding?

I have a project where i’d like to be able to save a set of presets for a particular comp, and thought the presets palette would be the way to go, but it doesn’t seem to be working at all for me, or I am mis-understanding how it is to be used.

Even dropping the presets tox into the jellybean displacement startup comp doesnt seem to save anything into presets/parChan

Ive just dropped it in, checked that install in parent was set to ON, hit initialize and then changed a parameter in the displace, stored it, and tried to recall, but nada. Nothing gets stored…the workflow list seems totally simple, but no luck here.

im on windows10, 099 build 2018.23760