You can use an image on the invoice email content. You can either upload an image or add the URL of that image.
Adding an image as a URL to the invoice email content will make it displayed correctly by every service provider.
Sending invoices with Simple Invoice requires you to subscribe to the Pro or Premium Plan.
Please follow the simple steps below in order to add an image to the invoice email content.
Step 1: Go to an Image Upload site in order to get an Url of the image you wish to add.
You can use imgbb, imgur, Cloudinary, or any other site you wish to use.
Step 2: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 3: Click on the “Settings” on the Simple Invoice dashboard.
Step 4: Scroll down to the Sending Options section, and click on the Image button on the Mail Content field.
Step 5: Add the Url of the Image in the URL field, and click on the OK button.
Also, in the Advance section, you can add Alternative Text, and change Width, Height, and Alignment.
Step 6: Click on the Save button.