Getting error: Attachment not found in digital product
If you are getting this error while publishing the products on Etsy, then provide a downloadable attachment with your product in the app which should not be exceeding the size of 20 MB. After clicking on this icon, there will be a pop-up will be shown for attaching the files from the App. If you don't have digital products then please check your Shopify store that you have enabled the 'SHIPPING REQUIRED' option for that particular product.
You need to log in the Shopify store then click on "Product" then edit the product.