You can not have 2 devices connected as you discovered.
Begs the question:
Why is a folder device left connected? The folder is a way to export books to devices that do not fit the other models.
If you run Windows (pro), There is a 'Remote Desktop Connection' free app that you could use to remotely control your PC.
VNC is an alternate and work with Linux and is installable on Windows versions that does not support RDC
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