Attaching Azure File Share to NGINX Container app using only the portal and NOT az cli

I have a Container App Environment, with Azure File Shares already configured. I create a Container App in the environment using image nginx:latest. I want to mount the /etc/nginx path to the storage volume. I have done this so many times, and repeatedly get a failed revision. I have successfully added a mount/volume if I export the YAML, modify and update the Container App. I need to know the process to do this entirely via the Portal.

1. Create Container App Enviroment – Check
2. Create Storage Accounts, shared access keys, file shares, etc. Check
3. Create App in Container environment. Image is nginx:latest.
4. Revision spins up, and is available.
5. I now want to mount the Azure File Share for proxy-shared-data as the /etc/nginx folder.
6. This is where I am stuck. The new revision fails when I do this. Container App shows Volume, Environment shows volume, Not sure what I am doing wrong. I have repeated this process over and over and same results – so must be missing a step.