Where's the screenshot from? The "description" and "additional details" look like GPT gibberish. The ASP.NET Core IIS module runs the entire Umbraco installation.
How does "document access" work in practice? Users download PDFs? Or something more complicated?
Since this is Azure, I suggest putting a CDN in front of Umbraco; then any standard links to PDF files will go directly to the CDN (which can cache all files) instead of going to Umbraco which then uses the Storage Provider to access the files in Azure Storage. There is built-in support for this in the Umbraco Azure Storage Provider, so it's easy to setup. For cached file access, Umbraco would not be involved at all.