File Transfer won't work

I have all of the latest version and updates on everything. I use free version of Teamviewer and have Windows 10. In the help sections it shows how to transfer files and there are tabs at the top. I don't have anything like that on mine. When I click on the icon of the file on the connection tab in the bottom right corner of my screen it says FILE BOX, No files available yet. I don't know what that is. Can you please explain how to transfer a file from the pc to the ipad and visa versa? Thanks