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Add the metafields you want to the comma seperated list. Once you have added the config and reloaded the site, you should be starting to see the new dynamic metafield. If assets allready has ben been synchronized into the asset silo, then you have to dele delete them, and sync again in order to see the new field.
An easy way to inspect the metadata for an asset that has been synchronized. Is to go to the DAM for Sitecore Administration dashboard DFS 11.0 - Asset metadata viewer and type in the assetid and local finf the section Dynamic Metadata.
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