The Default Addressable Scene Asset Manager is a general implementation of an Asset Manager that enables the World Designer Tool to work with Addressable Scene Assets. It is used to load Asset Chunks for LOD Groups that use an Addressable Scene Chunk Streamer. You can learn more about Asset Managers in general by viewing the dedicated Asset Managers within the World Designer Tool Chapter.
This Asset Manager is only useable when the Addressables package from Unity is installed in your project. You can find more information about this package, as well as detailed information on Addressable Related Systems, within the Addressable System Chapter.
Only a single Default Addressable Scene Asset Manager asset is required to be in your project, within the special Assets/Editor Default Resources/Deep Space Labs/SAM/AssetManagers folder. This asset can be created using a special Asset Menu command:
Assets - > Deep Space Labs -> SAM -> Regenerate Default Addressable Scene Asset Manager
--Special Note--
If you do not see this command in the Assets Menu, you likely need to Save and Close your Project and reopen it. This will refresh the Assembly Definition Files and enable the source code that is Addressable Dependent.
Keep in mind, you are able to create a custom Asset Manager if this default version does not suffice. You can learn more about this in the Asset Managers Section within the World Designer Tool Chapter.