You may already know you can add a watermark to a Word document, but you might not know that you can also add a watermark to an Excel sheet. Here's how.

Tap on the "+Marker" to automatically add those notes as an embedded image on the Excel file. Tap on the Camera icon to automatically save a screenshot of any drawings and the Excel spreadsheet.

You can add or remove a password from your Excel spreadsheets through the File tab. You'll do it slightly differently on a Mac and PC.