Many programs offer the ability to use keyboard combinations as shortcuts. By default, the local device you're using will capture these keyboard combinations, prohibiting them from getting sent to your Paperspace machine.
Our native app has the ability to "forward" these keyboard events so you can use all your hotkeys, just like you would on a physical machine. Within the app, you can also set your own shortcuts by clicking the Paperspace menu, selecting "Settings," and adding your own hotkeys.
This is still not possible in a web browser. We'll make an announcement if we discover a workaround.