Sending keystrokes to remote computer

Moved today from TeamViewer to Splashtop Personal and am using a Windows 10 Laptop (client) to Windows 10 Desktop (remote). I can't get keystrokes from the laptop to register on the remote computer. I have successfully pasted the clipboard as keystrokes to the remote & have successfully sent Windows shortcuts to the remote using the FN key, but how do I directly input keystrokes to the remote? I've spent a couple of hours searching and reading without finding a solution.

Thanks