bool SaveExternalCache ( const [FString](API\Runtime\Core\Containers\FString) & InFilename, const [TArrayView](API\Runtime\Core\Containers\TArrayView)< [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) > InAssetDatas, const [FThumbnailExternalCacheSettings](API\Editor\UnrealEd\FThumbnailExternalCacheSettings) & InSettings )