Customers cannot add the design to the cart after uploading larger images. Tested on several computers with different browsers. Some fonts cause problems and occasionally the customer's design differs greatly from the one I can download. The developer is aware of the problem and is due to the framework used. He sees no need for action here. After a design is in the shopping cart, it can no longer be changed, neither the attributes nor the design. All in all, it was a waste of money for me, so I can't do a serious business with it.