PowerShell to upload a file into multiple sites under Project Web App (Office 365)

This is a powershell script custom written to upload an Excel report to multiple Project Online sites, but you could easily customize it to suit your own purposes. The same method works on Office 365 and SharePoint Online sites.

Prerequisites:
You will need to install the SharePoint 2013 client components on your client machine. I am running it on Windows 7 so I am actually using the PowerShell 64 bit version and 64bit client components.

 # Load SharePoint Client  
 Add-Type –Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"   
 Add-Type –Path "C:\Program Files\Common Files\microsoft shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"   

I am using the newest version on Project online, hence the 16 hive. 15 hive works as well!