How to add background image into invoice?

Configuring  “Background Image” is one of the premium features of Challan Invoice. In order to configure your background Image follow the steps below:

1. Go to the Challan Invoice > Settings from your WordPress Dashboard.
2. Click on the invoice tab.
3. In the Invoice Background sub-section, toggle Enable Invoice Background on.
4. Upload your invoice background using the Upload Background.
5. You can customize the opacity of the background. For example: If you want the background opacity 50%, put 0.5 as the Invoice Background Opacity value.