How do you access Preview documents on iCloud?

Three years later and this is still not fixed. Even worse iCloud via the browser has no preview app to view pdfs either !!!!!

OOh yes, there is a lot uncomfortable things with iCloud like this one and all this things for a years without fixes or any changes and improvements.

This is why I just moved to Microsoft OneDrive, there I can store and open any files I need across any platforms and devices. More of this the same with Camera Roll. I can make pics on any mobile platform and have only one camera roll within the OneDrive. And I still using Apple devices.

Well, this is just how I've found a solution. I think the same can be implemented with Dropbox too. Maybe it will be helpful.

Instead of saving to iCloud Documents just drag+drop the document into a note in the Notes app, then on your ios device you can tap+hold and use quick view to open the document. I have tested it with PDF's successfully.

This is FINALLY fixed in iOS 9. Go to Settings -> iCloud -> iCloud Drive and then turn "Show on Home Screen" on. This will give you an app on your home screen that will let you see your entire iCloud Drive, view all folders, open supported files (including PDFs), and open files in other apps on your device. You can also share files via all of the standard options.

You can also access all documents in this way via iCloud.com now, under the iCloud drive option. However, at least on Safari for Mac, PDFs can only been downloaded from iCloud.com, rather than viewed in the browser. You can also email files from your iCloud email address, but you cannot share them via URL (Dropbox style).