Community
ive got the same problem but only half the sky is appearing for some reason
That's because your camera is looking downwards (Target is set lower than Eye elevation), so you're looking at the ground.
Hence the "half sky". Set your Eye Elevation lower and your Target higher.
Revit will only provide the sky/clouds background when you are in a perspective view. It's a bad practice to switch to perspective using the view cube, BTW. Always place and drag a camera.