The web app already running on .NET Core 3.1 LTS with IIS (windows server 2019)

Recently, I deployed as an Azure Web App Service but I encountered a file write error.

The application trying to create a new file for some business requirement.

Error message; `System.IO.IOException: Read-only file system`

Has anyone encountered this problem on Azure Linux Web App?

Solved: The Azure Linux Web App Service doesn't support directly file uploading to a regular folder under the wwwRoot. If you can running on the linux web app service, you need to use blob / storage etc..