I have now clicked the button in Teams on the top menu bar which says "Open in SharePoint". I then get the folder I was looking at displayed in a SharePoint UI. However, when I click the "Export to Excel" button as pointed out in your reply (for which "thanks"!) I get the entire file system of MS Teams (for our private project) not just the folder I was in.
Hmmm. Is this right? I just want to export file info from a few folders, not everything. Can this be done?