You can add preloaded images or text onto the product customizer canvas. You can control the size and the position of the images and the text on the canvas. This feature is really useful when you need to create a product design mockup that your customer can start customizing from a ready-made design.
Open the Custom Products page, edit any available custom product. On the product images area, there is a button entitled Pre Design.
In the Pre-design setting popup, you can add images and text to the product customizer canvas.
Click 'Add image' to add an image to the custom product. Or Click Add text to the text to the custom product. There are some parameters you can set for the images and text to make personalize the view.