How to make Animater linearly interpolate keyframes?

I bought an asset from Unity.
It has skinned character with animators.
The issue is that the key frames in the animation are at a lower FPS than my monitor. Or even lower than 60 FPS.
How do I tell Unity to linearily interpolate between the keys, because it is obvious there is no interpolation between the animation keys.

Assuming the problem is that keyframes are set to constant, you need to set all the keyframes to clamped auto or something like that in the animation window.

Ok, the issue was “solved”.
It was just running at poor FPS, and the Quest 2 could complete rotation frames on the device even when the link app is FPS is slow.