Recently the process of exporting Metabase data through an .xlsx file has been causing some headaches. We open the file to receive an Excel pop-up stating that following: “Excel cannot open the file 'abc123.xlsx" because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.” Is there any way to fix this? We didn’t have this issue in the last Metabase update. We have workarounds in the meantime but we need a permanent solution.
Please post “Diagnostic Info” from Admin > Troubleshooting.
And I’m guessing that the Excel file is only a couple of kilobytes in size - open it in a text editor and post the content here, since it’s probably a stacktrace error.