I've never been big into making maps, so now that I've started I'm experiencing some issues.

So, want to have the camera change to internal, then part again at certain points.
I have the first part working, I enter the clip zone and the camera changes, BUT, I can't get it to go back to default when I pass into the next clip zone.

I've scoured the internet, but I haven't found anything that has helped, so any help would be greatly appreciated.

Add a new clip. Place an empty trigger where you want the camera to go back to default camera.
That means, add a new clip, place these green squares wherever the camera should switch back to default, don't set any camera or other content in this clip.

I swear that is exactly what I tried before and it never worked.

However, just tried it again and it did, so thank you very much.