If your computer is not pushing files or document updates to owncloud, most of the time this is going to be caused by an issue with the OwnCloud Client on your Mac or PC.
Please first make sure that the OwnCloud client is running, it will look like a Cloud icon in your system tray.
SysTray on Windows is in the lower right hand corner, it is in the upper right hand corner on a Mac.
If it IS running and files are not syncing right click and choose quit OwnCloud.
Then launch the client from your applications folder, or desktop icon and make sure it shows up in SysTray
If it is NOT running, start the client and that will resolve your issues with syncing as it has to be running for syncing to work correctly.