Consider the simplest possible CSP file upload/download page - you upload a file, it's saved in the database, and the file is immediately re-download via %CSP.StreamServer:
InterSystems IRIS is a Complete Data Platform
InterSystems IRIS gives you everything you need to capture, share, understand, and act upon your organization’s most valuable asset – your data.
As a complete platform, InterSystems IRIS eliminates the need to integrate multiple development technologies. Applications require less code, fewer system resources, and less maintenance.