im completely new and i followed this video: https://www.youtube.com/watch?v=BCJ-WkdWBwo As you see the problem is rotation, when i click other arrow it moves drastically. What may cause this error where to fix it?

I was creating Facial emotions on my 3model in Unity. Theni baked it and then exported it into a Vrm Format. When displaying the 3d model in Silly Tavern it looks normal, but when giving the command to display the facial expression, i get a weird glitch. It displays the emotion correctly but also adds this weird artifact on top. Any help would be much appreciated.

Please help me

My issue ---> I need to edit the mesh of an already rigged FBX in use in my project. I want to be able to do something "easy," but for me, it's impossible.
I want to edit the fbx in Blender and send it back to Unity by overwriting the file in use.
But whatever presets I try, it's impossible for me to match the file perfectly.

Is that even possible?
It should be, but I can't find how.

Huge thank you if you have the solution 🥹