Synchronising Nextcloud Files on Windows

First, download the app: https://nextcloud.com/install/#desktop-files

Click through the setup; there is nothing special to watch out for. Then start the Nextcloud app.

A window then opens for authentication and authorisation. At the end, it should look like this:

If you want a specific folder location, set it in the next step:

Done

If you also want to see shared folders