I'm quite a noob when it comes to Sketch still, but I often use it for quick edits of images etc.
Now I want to create a customized mask for use in social profiles for my music. I want it to be a circle with triangles pointing to all 4 corners. But when I'm trying to mask, only one shape gets used. Even if I select all 5 of them. I tried exporting it as a png, but then I'm unable to use it as a mask.
Any suggestions on how to do this?