Traefik running in kubernetes cluster can be configured to forward the request “as is” without terminating the TLS connection. It allows to setup SSL passthrough using IngressRouteTCP object (TCP routing) which is based on TCP router concept.
You can download files and folders from Azure File storage using this PowerShell script. You can use service principal who has access to Key vault and storage account. The storage account secret can be saved in Key vault to be accessed through PowerShell script.
Postman can make REST API call to get access_token for a service principal authenticated with Azure AD.