Not sure why........ some files (documents) that put it in iDrive (Windows) do not show up in my iPhone iDrive directory.  However, I have no problem of seeing images in iDrive on my iPhone.  Weird!!! 

Anyone know how to fix this?

Is this iCloud? Not sure if that's the same thing.

I saw a weird problem once where the cache was corrupted. Uninstallation and reinstallation didn't help because the corrupt cache remained. I had to remove the corrupt cache and then everything started syncing normally.

The problem is finding where the cache for iCloud (or iDrive, whatever) is. It's inside the user folder somewhere.