Generally, if you drag an Excel file to a new email, the file should be added as an attachment. I’d like you to first check whether you are using the latest version of the Excel 2019 for Mac application and the Outlook 2019 for Mac application. If
no, I suggest you update AutoUpdate, update Excel 2019 for Mac and Outlook 2019 for Mac, restart the Mac and do a test to see the result.
Meanwhile, I’d like you to check whether the issue happens in a specific Excel file.
Moreover, upload some screenshots about “I am trying to email an excel file in office 2019 but when I do it, it makes me convert the file to a PDF. Or it makes me send it as a workbook.” and upload full screenshots of the pages
showing the version information of the Excel 2019 for Mac application and the Outlook 2019 for Mac application.
Note: Remove any private information before uploading the screenshots.
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