Flying mob won't do its flying animation (2025.3)

Hello, I've just come across a problem. I've made the model and the animations for my custom flying mob, but when it moves, it doesn't do its flying animation. 

Yes, I've enabled "Control keyframes using entity walk controller", I know it doesn't say anything about a flying animation, but hey, I don't have a clue otherwise. 

How can I make my flying mob do its flying animation?