Hi @jhq, welcome to the community!
I’m assuming by “timeline”, you’re referring to the timeline feature in CesiumJS. Is that correct?
If so, then I’m afraid that Cesium for Unreal doesn’t come with this feature. But if you’re open to writing some code and playing around with UI components, you could implement a similar timeline feature in your own application.
It would help to know what your use case is, too, just so we have that context when we make suggestions. Thank you!