Try these quick steps
It's worth a few minutes to check a few things, before trying the steps later in this article.
- Check your Internet connection - Sometimes your Internet connection drops and OneDrive needs a connection to sync. Make sure that your Mac is able to connect to the Internet properly.
- Reduce the size of any files that are over the limit - You might need to compress or resize a file so that it's less than 10 GB and try again. If you're adding a OneNote notebook, make sure each section is less than 1 GB.
- Make sure you have permissions to the file or folder you tried to add - Try to open the file or folder and make sure that you have permission to save a copy of it. If you're having problems seeing a file on a network, contact your network administrator.
- Check for files or folders with the same name in the same location - This can happen if you're uploading files on the OneDrive website at the same time, or if you made changes in your OneDrive folder on another PC that is syncing at the same time. Rename the file or folder, and then try to add it again.