Leave written feedback
Type, draw, or write on student pages the same way you do in OneNote 2016 or OneNote for Windows 10. Feedback you add can be seen in real time by your students.
Record and embed audio feedback
Go to the student’s assignment and make an audio recording with OneNote 2016 or OneNote for Windows 10. Your student can listen to your feedback from the same page.
Record and embed video feedback
Go to the student’s assignment and make a video recording with OneNote 2016. Your student can watch the video from the same page.
Add stickers
Go to the area of the page where you want to leave feedback. Select Insert, then Stickers. Select your sticker, customize the caption (optional), and select Submit.
Source: Microsoft