Issue title: How to use image/files from shopify as banners
 Issue body: hi,
I see there is an API available to get images - https://help.shopify.com/api/storefront-api/reference/object/image .
I'm assuming this is through the files upload, however I'm not able to get it to work. Can you show an example of how it is supposed to be used ?
 Comments: 
 Comment 0: Closing because this project is now deprecated.
{'source': 'GithubIssues', 'repo_name_with_owner': 'Shopify/shopify-node-app', 'issue_id': 306366086, 'repo_stars': 332.0}