PeopleHR does not support the '.msg' file format. To be able to upload that document you need to change the its extension to one of the Supported file types.
To change the file type 'msg' to 'pdf' type:
Double-click on your msg file then open it via Outlook application.
Go to File then click Save As.
On Save As Type list, select HTML option.
Open your newly-created HTML file in Microsoft Word, and save it as a PDF. To do that:
Go to File.
Click Save As.
On Save As Type list, select pdf option.
Upload the pdf file to your employee's document tab.