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Tags, Keynotes, Text, and Dimensions are the only annotation you can place in 3D views. However I found the following work-a-round:
1. Load your symbol in to a Keynote tag, and place a User Keynote to nothing (click on something, but it wont assign).
2. Overlay a second view, and have the Symbols in the second view (Drafting View).
3. Place the Symbols on the Sheet, and not in the view.
#2 would be my first choice. Thanks for posting.