My AR effect won't show up when I launch it

I am only begging to learn and when I created my first effect (cubes that spin when you touch them) I tried to launch the effect. I use my Mac air, so when I clicked launch - it opened a new tap with my camera on, and I only saw my face, no cube. I then copied the link into my iPhone, still, no cube. just my camera opened, with no AR asset. Im sure Im doing something wrong, hope someone can help out!