Hi Kendo Team,
The exported excel file from spreadsheet can not be opened in Microsoft excel when the spreadsheet has both a comment and a image.
You can reproduce the issue at your demo site https://demos.telerik.com/kendo-ui/spreadsheet/index
First add a comment for cell D3, then add a image, then export as xlsx.
Try open the export excel file, and you will see the error popup says "we found a problem with some content in workbook.xlsx ......"
It works when exporting comment and image separately.