Some functionality, like the Storage functionality, is not supported server side when using the standard Firebase SDK. If you find that you need to reference anything that is stored in the Storage bucket when using this SDK server side, you would need to use Firebase's official Admin SDK.
The admin SDK also allows you to access other more privileged information that should only be accessed from a server. We support both packages within the Flamelink SDK. See the SDK's Usage section to see how to use either the Firebase client or admin SDK's with Flamelink.