Upon selecting the Export button in a dashboard, the browser downloads an .aspx file alongside a .crdownload file. The browser indicates the download has completed and the .crdownload file is readable once the extension is changed to XLSX. This has only been reported with Google Chrome version 80.0.4240.183. No problems are reported with Microsoft Edge or Mozilla Firefox. The Log_Client table doesn't return any records for the time at which this occurs. The browser debugger shows this warning:
Resource interpreted as Document but transferred with MIME type application/vnd.openxmlformats-officedocument.spreadsheetml.sheet:
Release : 6.5.x
Component : Dashboard
Upgrading Chrome to version 87.0.4280.66 resolved this issue.