Hello Kexin,

The feedback channel is used for our product team to review feedback/feature requests. Since the post is more like an inquiry on how to do animation, I've marked this as Closed so that it won't be treated as a feature request :)

Please feel free to drop this question in the LottieFiles Community channel below where you can get more input from Lottie designers:

Forum:

Discord:

Facebook:

Thank you.