I have added my Nest Hello to openHAB. I also have created items for most properties. I have selected some of them in the openHAB cloud configuration, but not all of them appear under items in myopenhab.
For example, I can see this item in myopenhab:
FrontDoorCameraNestHello_Last_event_StartTime (Type=DateTimeItem, State=2018-11-18T06:59:43.328+0100, Label=Start Time, Category=null)
But I cannot see this item in myopenhab (URL replaced for this posting):
I did not add the URL to the posting for security reasons.
I just checked that this ImageURL does indeed change for each new motion event from the camera, just like the StartTime. So, myopenhab should display the item then, I think?
Try to change it’s name as a test, expose it and press Save in PaperUI->Configuration->Services->IO->openHAB Cloud
This will restart the addon and you will need to have a state update again for the newly renamed item to show up.