If you already have your own artwork, you can easily upload it with PostPilot. Be sure to refer to our Print Design Guidelines and ensure your dimensions are correct.
Here are the steps
In the design editor go to the background layer and go into the image section when you are editing that layer.
Then either drag and drop the file or click to upload your design file.
Once your image has uploaded your design is now the background for your postcard. Consider adding text elements to add personalization for each recipient!