The iCloud app is just a simple interface for managing documents. Photos are managed in the Photos app, and Apple has an entire section of Settings specifically for finding out what is using space in iCloud. No reason to clutter up the app moving in all the redundant functionality.In settings for iCloud, I have the option of Photos. So why wouldn't they show in the iCloud App? Something is being stored in there for all the available space to almost be gone, yet I can't see what it is.
What desktop or notebook computer are you using? The iCloud Drive app should work fine if all your devices are iCloud Drive compatible, i.e. OS X Yosemite or later, iOS 8 or later and iCloud for Windows 4.0 or later.The point still is that I can't see any files using the iCloud app. I can see and access the files on my computer but not via this new iCloud app.