For Azure App is the more preferred approach in using Azure Blob Storage. You must first create a blob storage resource on your Azure Cloud space. This links can be helpful: Recommended production configuration for Microsoft Azure
Deploy Platform from GitHub to Microsoft Azure
Deploy Storefront from GitHub to Microsoft Azure
But if it is really necessary this document can help. https://docs.microsoft.com/en-us/azure/app-service/web-sites-integrate-with-vnet