In Contributor UI when I select Thumbnail View in search pane I can only see some default image for each asset.
I would like to configure search pane to display thumbnails for my Image Asset.
I could not find any reference in documentation regarding this problem.
Check out these elements in the ElementCatalog (below) in the FirstSiteII and avisports sample sites. You can configure the thumbnail view results globally (when searching "All" asset types) as FSII and avisports both do -- or you can configure it per asset type (avisports does this for the AVIArticle type).