Why is my Fill series not working? There may be many reasons why your Fill series is not working in Excel. The most common cause of this issue is the disabled Fill handle.

If Excel is not highlighting cells in the formula, enable 'Allow editing directly in cells' and 'Enable fill handle and cell drag-and-drop' in Excel options.

Avoid costly Excel errors! Learn the top 7 mistakes users make and how to fix them for better productivity and smarter workflows. MS Excel is ...