Selecting story thumbnails
To specify story thumbnails, enter the edit story page and select PICK A THUMBNAIL at the top of the Properties tab on the right:
Search for a Photo to assign as the story thumbnail:
Select an image followed by the DONE button at the top-right corner. A confirmation message displays to check image translation preferences:
To finish, select SAVE to confirm changes:
Note: If you choose the option Yes, set for all, the selected image applies as a thumbnail to all the languages you have permission to operate on.