This keeps happening now, where I’ll copy in an animation (uasset file), set a skeleton for it, and then as soon as I hit save, it goes to a default static pose.
I’ve been using UE5 for a few months. I’ve brought in animations in this way before. I’ve tried different anim files from different packs and it’s doing it repeatedly. I don’t recall changing any animation related settings and I’ve tried in more than one project. Any ideas?
Okay I solved my problem, which happens almost every time right after I post about it. 
I’ll leave this up in case anyone else runs into it.
In the animation, I go to Additive Settings and set Additive Animation Type to either Local Space or World Space, and the animation will work again. Thing is, I don’t remember ever touching that before 
nor do I understand why it is needed now.
Amazing, thanks for posting the solution! I ran into it a fair few times as well. Mainly pops up when anim assets referenced a local UE4 Mannequin, and I then retargeted it to the starter content mannequin.
I found in some cases Additive Animation Type isn’t appropriate. One in particular I have to Export > Reimport (to fix Z translation) > then it stops, and it’s one that can’t be additive. (If it shrinks or disappears that may be why.) So in that particular case…
A solution is to export + reimport with “Use Default Sample Rate” (samples all animation curves to 30fps) under Import Settings. Then additive type can be no additive again.
But, that may not work for all. I have others it doesn’t work for.
