how to add the current pose of a humanoid object when you preview the animation?

I’ve tried looking everywhere for any information about this subject, overall the solution wasnt that clear. I’m trying to animate a 3d character for the first time using the POLYGON Modular Fantasy Hero Characters - Low Poly 3D Art, but the current pose changes, when i preview it with an empty animation, and it would be painful if i record the animation to match it’s default pose, and i:m pretty sure I’m using the correct avatar and the avatar doesn’t have missing materials.

Here is an image of the animation in preview mode:

I suggest using umotion for animating a character inside unity. It will let you see the animation, open other animations to adapt to your character, create animation layers, a lot of stuff. There is a limited free version I think. Maybe is enough for what you need.