Flutter Lottie: Works on Lottie player but not in Flutter

Question

Lottie animation works absolutely fine in lottie player but does not work in Flutter Web or Flutter Android. (Haven't tested on iOS)

Animation:

https://lottiefiles.com/113275-sad-character

Code:

LottieBuilder.network("https://assets4.lottiefiles.com/packages/lf20_7gs6bvae.json",
                      controller: lottieController,)

This is how it looks on Android or Flutter Web:

user_11557906 · Answer

I contacted the lottie help section about an issue, and they said some of the animation features are not supported.