Initial Setup on Windows

The MCH could be activated with the web app in the browser, so a desktop browser would work. Please watch the installation video if you prefer not to read the manual.
https://community.wd.com/t/western-digital-my-cloud-home-support-videos/279114/2

USB is also available from the web app using a browser. The ‘Desktop app’ is what some would call the WD Discovery software for Windows and macOS - that functionality is distinct from the web app and is being deprecated and will no longer work as intended after June 2023.