Upload documents to SharePoint in Plugin

Hi,

In my project we are integrating CRMOnline to SharePoint using server side integration. All works fine. Now there is requirement to upload the document from plugin to SharePoint. 

I am able to find sdk sample codes for creating SharePointSites and Locations.

https://msdn.microsoft.com/en-us/library/gg309548.aspx

But I am not able to find a sample code for uploading documents to the SharePoint Sites. Is there any message to do so or not yet available.

If available can anyone please provide me a sample code.

If not available can any one suggest any work around. I have found the below work around using rest. But is there any other way of doing this?

https://mscrmsama.wordpress.com/2016/03/21/plugin-to-upload-file-in-sharepoint-integrated-with-crm-2016/

Regards,

Pramod