Updating Thumbnails for Materials with Appearance Domains

The thumbnails are not automatically created or updated if:

You propagate modifications to a texture or shader document that is referenced by an appearance domain.
You import a 3D XML file.

The Update Thumbnails function allows you to trigger the thumbnail's creation or update.

The Update Thumbnails message that appears gives the number of materials and appearance domains open in session or not, their current status, and specifies if a thumbnail is created or updated. This message describes the detailed report, including messages and corresponding actions.