You can have a drawing automatically notify you if any new layers have been added to it.
New layers might be added when you attach external references or insert blocks. Also, if you work with shared drawings, new layers might be added by other contributors.
When the layer notification feature is turned on, and a new layer is subsequently added, a balloon or dialog box message appears after specified operations that involve files, layers, or plotting. The status bar also displays an icon that alerts you to new layers.
When a new layer is added, you will want to make sure that it displays and prints as intended, especially if you use special layer settings for plotting, or if you set property overrides in layout viewports. Here is the general process:
The Unreconciled New Layers filter is automatically created when the layer notification feature is turned on, and a new layer is subsequently created or generated.
The new layer notification feature can be controlled from the Layer Properties Manager, Settings button.