Could you show me where in the documentation it describes how to do this? I've created a new product and checked enable design and upload design, but do not see a button.

 

EDIT:

I was able to figure this out. Is it possible to display a different template designer based on printing options? For example, I have a custom canvas product in different sizes and I would like to display a different template based on the size selected. Am I able to specify dimensions for a template somewhere? For example I need a template that is 8x8 and another that is 14x14.

Thank you.