Gravity.

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Does it work upwards or downwards?

Neither.  The attractant vector is toward the greatest retardation of the temporal dimension.  That's all.

Think of gravitational attraction as being the same thing as "Falling".

So the answer to your question is: Downwards. You "fall down", and do not fall "up".

"Down" means "Towards the local center of mass". Which here on Earth is the center of the earth. So here on Earth "down" is toward the center of the earth. So if you jump off a cliff you fall towards the center of the earth, because the earths gravity is "pulling" you in the direction of the center of the earth. And you will continue to fall towards the center of the earth until something breaks your fall...like the hard ground. Which will result in you decelerating to zero with such great suddeness that you will go SPLAT!.

Now at the same time the whole big earth is ALSO attracted to you ( because your body also has mass and thus also has a certain amount of ability to gravitionally attract matter.) So in a sense the earth is also falling up toward you. But your body's mass is microscopic compared to the mass of the Earth for practical purposes you fall on the earth, and the earth isnt thought of as falling towards you (even though both you and it have mutual gravitational attraction).

But I am speaking in strictly Newtonian terms. We shall save Einstein, and warped space-time for another time.