Download the Excel file from Azure Data Lake to your computer.
Open the file in Excel — you’ll see multiple sheets, including the one you want to update.
Replace only the data in the sheet you want (e.g., "DataSheet").
You can delete the old rows and paste in the new data.
Make sure the column headers and structure match exactly.
Save the file — don’t change the file name or move sheets around.
Upload the updated file back to Azure Data Lake using Azure Storage Explorer or another Azure tool.
The rest of your Excel sheets (like pivot tables) will stay intact as long as you don’t rename or delete them.
Always keep a backup before replacing data.
Use consistent formatting (same column names, same data types) to avoid breaking any reports.