You do the voices first, at least in the west. It’s acted out, then the animator times their animation to the voices and creates the character performance. In any animation, you have the sound files as a layer and scroll back and forth to find the timing of the dialogue and which drawings to put where. It used to be that you’d have to mark off the dialogue in an x-sheet, basically a sheet noting which syllables are said at which frame.
In Japanese TV animation it used to be common(probably still is) to animate the performance first and have voice actors come in after- hence the anime random mouth style of lip sync. Makes it easy to stretch if needed and does away with the timing step.
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