The Link Files and Link Folders options within OverDRIVE allow you to quickly add files or folders from anywhere in Google Drive to your active OverDRIVE folder (ie the current page you are on). If the page you are on contains a Folder Tile you can click on the + icon within it to open the Add Content options. Choose Link Files or Link Folders within the dropdown. Choose the files or folders you wish to add and click the Select button.