Polypad Challenge Creator Help


I am looking for help with the CL for an activity I am attempting to create with some of the new features available in Desmos Classroom involving the Polypad and Challenge Creator features.

My goal is for students to create a geometric figure using a collection of algebra tiles, and then write an expression to name the perimeter of that collection of tiles.

1.) How do I get the collection of tiles that the owner of the challenge creates to show up on the “Solve the Challenge” screen for another student?

2.) What is the best way to use the CL on the student expression submission to allow for any equivalent expressions to be shown as correct? ex: “x+x+x+x” or “4x”

Here is what I have so far:


Thanks to anyone who can offer help!