Copy previous sketch by student to next slide

I am trying to teach velocity vectors and acceleration vectors in calculus.
I want to have a sketch with a path curve on the background. Students should draw the velocity vector on slide 1, then on slide 2 I want them to draw the acceleration vector on the same path at the same point. How can I get desmos to carry over the slide 1 drawing to slide 2?
(I want them to see if the acceleration vector makes an obtuse or acute angle with the velocity vector)
I understand that Copy Previous is gone, btw.

This should copy the previous sketch to the next one.


You can also layer it over multiple screens by merging sketches from previous screens.

background: sketchLayer(mergeSketches(sketch1.sketch,sketch2.sketch))