Firstly you will need to have at least one image in your OneDrive's camera roll folder. You can check this online here - https://onedrive.live.com
and look for a folder called 'OneDrive camera roll' (Might also be SkyDrive camera roll if you've had a OneDrive back in the SkyDrive days like me)
Now with an image in the camera open the app and look for the camera roll folder and open your image, you can then 'scroll' through with the
which will cycle the same image over and over.