Architects will need to use your structure drawings as reference in their drawings.MEP engineers need architectural drawings as reference.
The layer snapshot is deleted after the conversion.
You can save the current layer settings in a drawing as a saved layer state and restore them later.
You can also add new layers to a layer state if new layers were added since the later state was saved.
When an xref containing saved layer states is inserted in the host drawing, the xref layer states are listed by name and can be viewed in the Layer States Manager.
Saving layer states is convenient if you need to return to particular settings for all layers during different stages in completing a drawing or for plotting.