First click the flag (as always). Then you can draw lines, with spacebar you can play back what you have done. This is the start of a project where you can upload you're own drawings, but currently are cloud data lists not available. So I have to wait for that.
I made it by myself, but I need help, because the last drawn line doesn't play back. So if you know the solution for that, leave it in the comments or make a remix!