I have had Clip Studio Paint EX for 5 years now and I have been working on a huge story 800+ pages and 75 gigs (my CSP cloud is full). I'm on a Dell PC and an Yinova Tablet (I love but it's too heavy for the airplane)

I recently bought a new iPad Pro 12.9 and my NIGHTMARE syncing to the PC began.

I managed to get the files and .cmc file (all in one folder) on the iPad via a flash drive.
The files I downloaded from the cloud (using Microsoft One Drive, where I back up my project)) took 3 hours and the CSP APP on my ipad did not open the .cmc file from the cloud version.
I also tried Apple's iCloud- TOO HEAVY TOO LONG
The .cmc file did o[en off the copy I made from the flash drive and after test editing and saving a few pages and then copying those test fules back to the PC, CSP on my PC said THE FILES WERE CORRUPTED.