I want to make my Shopify Website installable. I do not intend to make it a complete PWA. Just having a 'Add To Home Screen' would suffice for me. I do not want to go much into cache and offline behaviour also.
I know how to make this for a self-developed website (i.e. Linking with manifest.json). I tried to edit the theme files and achieve the same result but it didn't work. I am getting the 'start_url' error.
P.S. I do not want to use any third party Shopify apps for this.