If you’re working with cameras and using the debug camera, be wary of that. It may seem like the debug camera is an easy way into adding “freefly” to your current one. The truth is, the debug camera is an independent one that does not affect the current.
This may sound like an obvious thing but it’s easy to forget about it and make silly mistakes, like we usually do in game development. If you’re working with raycasts or camera transformations, you could waste hours trying to figure out what’s wrong. (yes, it happened to me 
)
I would really advise anyone to integrate freefly into their camera by scripting it in. I’ve found this simple script by adamviola that you can attach to your camera’s, just for debug purposes if you don’t mind integrating it.
For the record.