Hi Alynn,
If the SharePoint site is syncing on your PC, there should be a folder in quick access section in file explorer. Also, there should be a record about the SharePoint site synced folder location in OneDrive settings. Please right click on the OneDrive icon for your Office 365 business account in task tray > settings > in Account tab, check if there are SharePoint site location:
If yes, the SharePoint site is syncing on your PC, and as you said that when you drill down to C:, the folder is still here, so you can just right click on the synced folder > click Pin to Quick access to check the outcome.
If no, the SharePoint site may has been stopped syncing in unconscious, I suggest you re-sync it. When you set up the syncing, you can choice using the same location.
If this is not your situation, I would like to confirm the following information to clarify your situation:
- A screenshot of Account tab in OneDrive settings, just above picture one shows that.
- A screenshot when you right click on the Sharepoint site synced folder, as the second one shows that.
- The OneDrive version you are using.
- When did you found that, did you do some settings for the folder or something else?
Regards,
Linda