How to make animation with one frame for additive animation

Godot Version

4.2.1

Question

I want my character to hold leg up. But godot cant see animation when frames is not moving. I made animation with 10 frames insted of 1 but still nothing
Animation contains keys of all bones and they all similar to t-pose except left leg
I actually want to figure out how to add single frames for additive animations but when nothing is moving in animation godot doesnt want to play it

just found what causes the problem. godot doesnt want to create tracks for bones.


found sollution to create animation with keys blending from my wanted frame to t-pose and then delete t-pose and make animation 0 frames