Windows not updating folders from the OS X drive
My experience with Windows 8.1 and Yosemite is the HFS+ drivers installed in Windows do not work very well. In defense of Apple, I have a 2007 iMac and Windows 8.1 is not approved for my model.

I assume you are not using Core Storage. If so, you could try the free drivers from Paragon. See link HFS+ for Windows® 8/8.1 Free Edition

Note: You can test for Core Storage by opening a Terminal application window and entering the following command.

diskutil  cs  list


If you are not using Core Storage, the result will be

No CoreStorage logical volume groups found