Unit 3 Project - Transparent Images in App Lab

I was wondering if anyone could help me with this: My students are working in App Lab for the CSP Unit 3 Project. One of my students is trying to place a transparent image on the screen, and even though a google image search produces many such pictures, trying to use one in App Lab leaves the transparent checkerboard pattern. I assumed it was a png with transparency. Is there something we’re doing wrong? I’ve been unable to help my student.

@jgregory Thanks for asking this question. Please post a link to the project so that we can see the code. I will also pass on to the curriculum team.