The Microsoft Office Upload Center was a new feature added to Office 2010 and still available in Office 2013 and 2016. It allows you to manage documents you upload to OneDrive. If you upload a lot of documents at a time, this can be a helpful tool.
However, if you don’t upload many documents at a time or at all, you can remove it from the notification area on the Taskbar. It’s simply a matter of changing a setting in the Upload Center.