I can't optimize lottie json file even i paid premium version

If I optimize the lottie file to reduce size, the file is empty. Vector elements seem to exported normally, but png assets are not being exported. Does anyone know how to fix it?

@pillyze are you still facing this issue? If yes, can you raise this to our support team with the file?
https://help.lottiefiles.com/hc/en-us/requests/new