Bones causes cracks when moving

Im very new to blender and i have been trying to get a hand rigged for a game im making, i found the hand in some free models and it looked perfect so i tried rigging it with bones and it seemed fine until i moved it

i can only post 1 picture
image

i used automatic weights please help

I think this hand has bad topology for animating.

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My bet is on that gigantic boolean hole through the palm. My second bet is bad topology and flipped normals.

I don’t think you should put that hole through the palm when you’re rigging and animating.