Along similar lines, in update 2.4.7 a test jetway function was added. What key does this? I've seen mention of the num-5 key.
The Test Jetway feature has always been available, what the updater changed, is that before it was only available when editing the Parking itself, after the update it works even when editing the Stop position, which is more useful, so you won't have to constantly go back to the parking just to test the jetway while you are editing the Stop position (which is the most important for the jetway).
I just realized it's not documented in the MSFS version of the manual, because its explanation was part of the larger Jetway customization features in FSX/P3D, so the whole chapter is just not there, the only feature that is relevant for MSFS is the Jetway test.
No, there's no risk of conflict with the default Drone camera, because the NumPad 5 assumes you have NumLock enabled, otherwise it's Shift-NumPad 5, so it's not an issue with the drone camera.