If we've crawled/harvested thumbnails, those thumbs will be the first entry in the document.document_assets relationship and they'll be used by default.
Alternatively, you can upload an Asset, and if image derivatives can be made from that file, those will be the thumbnail.
If we've crawled/harvested thumbnails, those thumbs will be the first entry in the document.document_assets relationship and they'll be used by default.
Alternatively, you can upload an Asset, and if image derivatives can be made from that file, those will be the thumbnail.