Ahh I see what’s happening now, thanks for the video, that helped a lot!
The behavior you’re getting is actually expected based on your setup. The Create button only works when you have exactly 2 cels selected with no existing cels in between them. Its purpose is to generate new in-between frames from those two endpoints.
In your case, you’re selecting a range that already has cels in between, so Create won’t do anything there. That’s why Update works instead, because it’s designed to modify an already existing generated range.
So the correct workflow is:
- Use Create > when you only have 2 key cels (start and end, nothing in between)
- Use Update > when you already have existing cels and want to adjust them

I might improve this behavior or add a warning in a future update.