It all should work (example panel with your knob attached).
there are 2 things you propably got wrong:
– the frames are stiched horizontaly not verticaly (there is a special property to select that), but i recommend using vertical export (when i wrote the code for this i was doing all stuf verticaly, and all the math thats there to render those frames is mostly tested for vertical alignment, horizontal should work too i just didn’t test it as much)
– you need to specify frame size (yours is 51×51)
apart from that you are all set, open the example.
