In Digizuire assets has metadata and each customer has its own set of metadata. These is was we call dynamic metadata. In order to them into Sitecore when you synchronize. You have to add them to the configuration.
<setting name="DFS.Digizuite.DynamicMetadata" value="5eb3eefc-a043-410f-89b0-29ed3ef37078,c8bb4af3-1598-4ea4-8d7a-98d54eead977" />