If required, you can export any of the annotations that you created. Exported annotations are be saved in the .ORSObject file format, which is a proprietary binary formatted file.
Annotations can be imported at anytime and then added to a scene.
The suggested file name is the annotation title. You might also find it useful to add a reference to the view in which the annotation was created. For example, Ruler1_XY_MMDDYYYY.
The imported annotation is added to the Data Properties and Settings panel. See How to Show or Hide Objects in a Scene for information about changing the visibility of imported annotations.
NOTE You should show the annotation in the same axis representation in which it was created.