In an assembly, annotations can become detached in drawing views when you promote or demote a component in the browser structure or replace or delete components. Use Auto-Reattach Orphaned Annotations to preserve these feature-based annotations.
Change the Document Setting to preserve invalid annotations: Click Tools tab Options panel
Document Settings .
On the Drawing tab, in the Invalid Annotations box,
In the drawing view, annotations to reconnect are shown in the highlight color. Select one or more annotations. Autodesk Inventor reconnects annotations with valid attachment points.
If the annotation cannot be reconnected, the Design Doctor opens and you can select one or more options for treatment.