I've also seen statements about supposedly being able to share projects with other members using CL cloud. I can use the it to upload projects from my Android device using PD Mobile and I can transfer contents and projects from one PC to another, but all devices have to be logged in to the same account.
It would be very helpful to use project sharing here on the forum but like you, I haven't found a way to do that. All of the media sharing hits I've gotten when searching through the FAQs and the Cyberlink website seem to be for PowerDVD and nothing comes up for sharing any of the editing apps' content with other users.
I have a 1TB OneDrive account included with my Office subscription and a free 15GB account from Google, and there are plenty of free file sharing websites out there if you don't currently have a service and don't want to pay for one.
Using
Rate Us & Provide Suggestions under PD's
File menu would at least let CL know that you'd like to see that feature added to the CL Cloud.