

Upload button is the most basic option, which is on the library.
Option 2: Drag and Drop
You will find a new feature called Drag and Drop in SharePoint Online or SharePoint 2013.
This helps you to skip a step by saving the documents to the desktop instead, you can directly save them to SharePoint.
Below are the steps you should follow:
You will see a window that pops up; paste the URL of the SharePoint Site in the address window.





