How can i ply 2 animations at the same time with the same press of a button?

I have recently added some hands into my Unity game, the hand being one object. The animations that I have made in blender are for each hand(Left and Right). I want to be able to play the 2 animations (Left and Right animation) for walking when i press the button W. I asked this question previously and was linked to unhelpful answered questions. I have also looked into the layer technique, but can’t seem to get it to work.

Any ideas?
Please help

Are both your hands one object? If so, it won’t work, you either make both hands move in one animation in Blender (best way), or make 1 object for each hand.