I downloaded the character and put it on my webpage without any problems with threejs, and then I downloaded an animation and attached it to the character. But when I changed the animation, it made the character fly in the sky and stay in the sky like a balloon. (Standing Clap.fbx). I noticed that some animations work in some characters and do not work in others. Please help me how to fix this problem.
Is this a Mixamo character or your custom character? If you uploaded your own character and rigged it in Mixamo, then the animation should work. Can you share your file or the screenshot of the issue you are experiencing?
A lot of the jump animations have a different start point