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Animating particle vector parameter in BP not working

[I’m moving this over from Rendering to see if I can get an answer from the BP sub-forum]

I think I’m missing something here.
I’ve exposed a Vector Parameter on my simple particle setup shown here (it shows Param Modes of Direct there, but I’ve tried Normal & Direct with the same result):

eaa514c68350e57ede21db92eb49cc5f576bbe98.jpeg

And connected that vector parameter to a timeline in the Blueprint shown here:
1cf02bf2236019796138b9aed794a27d5e9abb4f.jpeg

The parameter isn’t animated when I play. Is it that only certain parameters that work or is something goofy with 4.12.5?

I’ll try something similar in 4.13 to see if I can get that to work.

Let me know if any of you can think of a way to get this to work.

Thanks,
Alec