Hi @Hannah Adams,
As per my knowledge, it is not possible to directly sync a mapped network drive to OneDrive, as OneDrive only syncs with folders on the user's computer or mobile device using a sync app.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.