You can add articles to your team library in two ways:

1. Select PDFs from your desktop (or an export file from another reference manager. Drag and drop files into into the browser window. Just make sure you have the folder selected that you want to add those articles to.

2. Add articles from your personal library by selecting one or more and dragging them on top of a shared group library. When it flashes green, it means the import is complete!

Once those article are in a shared library, all team members who have been added to that particular shared library will have access.