Create a new "File Share" using Storage Accounts. The result will be a folder that you can share using the NFS or SMB protocol within the Azure cloud.
You can upload some files to "File Share" using the web interface or using the desktop client.
Create a mapping between your web application and the share following [this procedure](https://learn.microsoft.com/en-us/azure/app-service/configure-connect-to-azure-storage?tabs=basic %2Cportal&pivots=container-linux) This will result in having shared files available in the web application container.