Why doesn't this work on mobile?

https://360.articulate.com/review/content/f74ab848-7b79-4a28-90a7-38bdcac04959/review

This is the page I'm having issues with, specifically the uploading submission layer.

The user is supposed to click the three buttons at the bottom to get a popup with more info. Usually I'd do this a layer but it's already on a layer so its just a shape with all the bits in it that starts as hidden then the button changes it's state to normal. Easy peasy.

It works perfectly fine on desktop where I've tested it but on mobile the boxes don't change to be seen. The button reacts as if its been pushed but nothing happens.

Any ideas?

File attached

Cheers