Hello, thank you for the feedback!
I was thinking about adding some additional functionality for the frame selection of nested prefabs, I'll see what I can do with it
In the meantime, there is an "easy" way to quickly change the used frames one by one by using arrow keys and the mouse wheel:
- Click on the first frame of the prefab layer you want to start from
- Hover mouse over the Frame bar in the Prefab Window (but don't press it!)
- While hovering over the Frame bar, use your mouse scroll to change the prefab frame
- Press left/right arrow key to go to the previous/next frame on the timeline, then go back to 3. until you've updated all frames
With this setting correct prefab frames is a bit faster than dragging the bar with mouse and then clicking the next frame, but it's not a perfect solution by any means, sorry for the inconvenience :(