My version of Black Ink refuses to do more than 7 layers. I've tried to verify the integrity of the application's cache on Steam, it says there two files had to be replaced, but yeah, I still can't add any more layers to the drawing I wanted to make (It's supposed to be a cave, I know you can't tell. I can't either =_=)
I don't think 7 layers is supposed to be the maximum amount of layers