expand memory? you can't do that
I think you got some terminology confused, and sadly I'm not sure what.
custom animations are done as a whole using FEditor/your spriting and text editing programs of choice. I realize I'm becoming a broken record with this but chapters 57-58 cover that--a custom animation covers the standing, dodge, critical, range, etc., i.e. it covers every pose, once you make it and insert it using FEditor all you have to do is set it up for the game to use it using Nightmare modules (such as the battle animation editor,
custom battle animation editor, class editor, character editor, etc., depending on what you want to do--the tutorial should also cover this though, lol I really am annoying even myself with my "bla bla bla tutorial" rampage...)