How to add the files space in a Teams to your Windows File Explorer

In Microsoft Teams select the General section of a Team,  go to the Files section and choose Open in SharePoint

This will take you to a website. Select Sync.

It will prompt you to Open in Microsoft OneDrive, tell it to open.
This may look different depending on what you have selected as your default web browser.

Now look for the Files section is syncing with your computer and is available via File Explorer.