If you are not using Kaizena (formerly Voice Comments) to provide feedback to your students via GAFE. My students truly appreciate the audio along with the highlights pointing out the improvements.
As a side note, be careful highlighting different locations as you record. When you go to highlight additional areas the audio recording will start over again.
Learn how to use advanced functions in sheets, Conditional Formatting, Editing & Customizing Data settings in a spreadsheet, creating pivot tables, using autoCrat for mail merge documents, using Doctopus and Goobric (along with other tutorials).