Login at https://hub.pathpilot.com/login?next=%2F
Click on "Create Virtual Pathpilot Controller"
Browse for a file and press "Upload"
Click on "Enter Pathpilot"
Choose your machine
When the PP screen appears click on "File" tab
If you do not see your file click on "Refresh" (the circular arrow thingey)
Highlight the file and click on "Copy"
Load your gcode as usual.
You can go back to the original browser window and upload additional files. Remember to press "Refresh" after each upload.