It has come to our knowledge that Microsoft is applying more restrictions to free OneDrive user accounts. Earlier, Microsoft had shrunk their disk space from the promised 15 GB to 5 GB for users who didn't have a paid subscription. This time, the company is reducing the available outgoing traffic for files shared by a free OneDrive user.
The SkyDrive web service these days is an important part of the Windows 8.1 experience. It has deep integration with the OS and has become a part of the File Explorer and Modern apps.
Sometimes, usually right after installation, Windows 8.1 shows you the "synchronization in progress" overlay icon for one or several of your Skydrive folders.
When you look inside the folder, you will be surprised though that all the contents are already synced!