sprite sheet jitters

Hi, so it turns out you can export sprite sheets by making the animation a symbol and then exporting, but what that does is it exports each of the actual drawings, and lines them up. If the frames are even slightly different in size, it puts off the entire sprite sheet and makes it very hard to use later. Basically, the sprite in unity just sorta subtly jitters as a result, it's annoying.

I wish I could export the whole scene as a spritesheet, so that the dimentions are uniform accross them all, but i'm pretty sure it's not a feature yet. Hence, I formally ask if that it can be added to adobe animate; for the sake of the world of videogames rests in thy hands. or just tell me i'm an idiot and educate me, i've been stuck here for days. thanks