Please post a picture of the piston.
How to take a picture of a piston.
Open CoRE from the SmartApps menu.
Click on CoRE Dashboard (located at the top of app when you first open)
At the very bottom of the dashboard is the URL for the Dashboard Link that you can paste in your browser.
OAuth must be enabled for CoRE for this to work. Please see http://thingsthataresmart.wiki/index.php?title=CoRE#Enabling_OAuth
With the dashboard URL open in your browser, find and click the piston you want to share.
Click the three vertical dots on the right then click the Camera icon.
Right click on the image the pops up then save the image.