FileSaveMode
From Director Online Wiki
This is an undocumented property of 3D members. Its default value is #saveOriginal, which means that any Lingo changes to the 3D models in a member will not be saved in the member permanently. However, if you use #saveMarked, then any models that are cloned will also be saved in the member. If you use #saveScene setting, then changes to existing models will be saved, but not new models created. If you use #saveAll, then all changes to the models will be saved.