In the dialog box, select an Excel file and click Insert. An Insert File dialog box will appear. Inside the box, if you select Attach File, a link to the file will appear on the OneNote page.

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

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Microsoft Excel adds Copilot AI to help fill in spreadsheet cells The new ‘COPILOT’ function uses AI to generate summaries, tags, tables, and more based on a group of cells.