Hey! I've recently been using the Custom Types API to manage shared slices which is great, but I've been unable to correctly set either an icon or a preview image thus far.
The documentation briefly shows the concept of an imageUrl field on the JSON schema for the SharedSlice, but it doesn't appear to work once it's pushed.
What's the property we'll need to set on the SharedSlice to actually change that preview? Or alternatively, how can I set an icon?