MAC PC Steam & Saved game

I have PC and Mac which are located at different places far from each other.
Also I have a Steam version of Walking Dead.
My problem:
I played it on my PC, after that i came home and thought that all saves will be available on my Mac via steam cloud. But it is not so...
Could you please tell me, is it a bug, or steam is not supporting cloud for "Walking dead" saves, and to play on my Mac i should copy my save files annually?

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