iCloud is NOT end-to-end encrypted. Therefore storing sensitive data on iCloud is a bad idea.

GoodNotes should support storing its document database on Sync.com. Sync.com is very similar to Dropbox. It's easy to use, has good Mac integration, as well as apps for iOS and iPadOS. And it's 100% PRIVATE, unlike Dropbox, iCloud, etc.

Please support Sync.com. Many users want the kind of privacy that only end-to-end encrypted storage allows. I'd love to have access to the medical records, receipts, etc. that I keep as PDFs. But I will not import such information into GoodNotes until end-to-end encrypted storage is supported.

Adding support for Sync.com would be the quickest and easiest way to accomplish this.