Why does my character chrink when i add a animation to it?

evry time when i add a animation to my character it shrinks and i can’t do anything about it please help me

Looks like something strange is happening with data from your model/animation edit. This is not being caused by unreal.

Maybe bone weights are off, Applied scales are different…
Really could be a handful of different issues but it looks like its your model/animation/weights/scale difference.