- Check that the file type you’re trying to insert is accepted by OneNote. For example, OneNote only allows images, audio and video files.
- Ensure your file is less than 25MB.
- Make sure you have the right permissions and access to insert the file you’re attempting to.
- Try clearing the cache and restarting the application.
- Check that the file you want to insert is still stored in the same location.
- Consider inserting a link to the file rather than embedding it into OneNote.