If you do not see notes in your cell, this means that in the Excel settings, the option ‘No comments, notes or indicators’  is enabled. Follow the steps below to see the notes in Excel :
Click the File tab.
An Excel Options dialog box.
Click the Advanced tab on the left.
Under the Display section, under 'For cells with comment show,' you can choose either of the two options ‘ Indicators only, and comments and notes on hover’ or ‘Indicators and notes and comments on hover.’
Then click OK.