Copy previous sketch by student to next slide

Questions
1

Hi,
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.

2

This should copy the previous sketch to the next one.

background:sketchLayer(sketch1.sketch)

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

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

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