Microsoft Teams - Add Teams / SharePoint files in File Explorer
How to add and sync the Files space from a Team within Microsoft Teams to your File Explorer on a Windows device.
1. In Microsoft Teams select the General section of a Team, go to the Files section and choose Open in SharePoint.
2. This will take you to your online SharePoint page. Select Sync.
3. It will prompt you to Open in Microsoft OneDrive, select Open.
  This may look different depending on what you have selected as your default web browser.
4. Now look for the Files section is syncing with your computer and is available via File Explorer.
Microsoft have an article with more details that can be found at this link: https://support.microsoft.com/en-us/office/add-shortcuts-to-shared-folders-in-onedrive-for-work-or-school-d66b1347-99b7-4470-9360-ffc048d35a33