I would ideally like to have my LR catalogue file in my Create Cloud folder along with the smart previews for the catalogue so that I can view this on multiple computers without having my external drive (with source media) plugged in all the time. However when I move my LR catalogue to the CC folder, it appears with a red exclamation point which seems to indicate that it cannot be uploaded. I have plenty of space.. whats the deal?
The catalog needs to be on a hard drive that is local to your computer. There is no provision to use Lightroom desktop to link to images in the creative cloud. If you have an Apple mobile device and a creative cloud account you can use the Lightroom Mobile application that was introduced in Lightroom 5.5 (I think).