The key image is a property of a stack, and refers to the image which is most representative of the stack as a whole. This image will then be used as the thumbnail for the stack both in case view and when the stack is included in an article.
The key image icon is located in the top left hand corner of a stack when viewed. The currently selected key image is denoted by the light blue icon. Each stack can only ever have one key image at a time.
To change the key image simply scroll to the desired image and click the un-selected grey icon, which will then turn blue.
To update the thumbnails the page will have to be refreshed.
Only some users can change a given key image:
- all users with administrator / edit-anything privileges
- the owner of the case