Overview
The main steps are divided into two parts:
- Go to the Shopify settings page to add the metafield.
- Specify a metafield type to the URL.
Set up a URL for metafield in Shopify
Next
- Add the corresponding metafield data to the product, which should be a public file link on the Internet.
- Select the product you just set up and print it.
For detailed steps, you can take a look at the article here.