If what you want to do is to have a permanent link printed on your products, which will always lead your customer to a PDF file, there are a few ways to go about it.
1. Embed the PDF into a Shopify page
- You can upload your PDF file to Shopify and get the file URL.
- Then through iframe, you can place the PDF within a Shopify page you create.
- Then you can share the Shopify page URL on your product.
2. Use a 3rd party hosting service
- Alternatively, use a third party hosting service like Google Drive / Dropbox / Titlegram to host your PDF.
- These services would generate URL for your PDF that you can share and place on your product.
- Among them, Titlegram is designed specifically for PDF and could provide a nicer branded URL (Example titlegram file: https://zappublishing.title.is/guide)