Share a file or folder by inviting people. Go to the site library that has the file or folder you want to share. Right-click (Win) or Ctrl+click (Mac) the file you want to share, and then select Share. This can be done with the OneDrive sync client on Macintosh, Windows or mobile devices, or in OneDrive accessed via https://o365.dartmouth.edu/.
Please see the Microsoft support article Share OneDrive files and folders for more information.