This article will explain how to add a SharePoint Library to your OneDrive. 

1. Ensure you have OneDrive running, and then open the SharePoint site you'd like to add. 

2. On the left Navigation Bar, click the Documents option. 

3. In the Documents panel, select the General folder to display the documents in the library. Then click "Add Shortcut to Onedrive" on the top command bar. 

4. SharePoint will then open the link and add this library to your OneDrive files. You may also see a prompt asking to open the link in the OneDrive program, if you see that, just accept the prompt by selecting "Allow" or Yes". 

5. Adding these documents to your OneDrive folder will take some time, depending on the number of files in the library. To speed things up, you can also just open the individual folders you want and then hit the option to "add Shortcut to OneDrive" and only those specific folders will be added. In this example, I've selected the Market Research folder and now click the Add Shortcut button will only sync the files from this particular folder. 

6. Now that I've added the Shortcut, my files will begin syncing to my computer and into OneDrive. You may notice that some files are missing at first, this is simply because the sync takes time. Eventually all the files will sync to your computer and you will be able to access them normally. 

7. The files will appear on your computer in the File Explorer, under the Onedrive heading that's labeled "Name - Olympus Property", for example, mine is "Quinton - Olympus Property".