If you made your Capital Gains entries from any "T-Slips", (T3, T5, T5008), they will not show up on the Schedule 3. Only entries which you have entered manually in the Capital Gains profile show up with the details on Schedule 3.
The reason for this is CRA already has a copy of those slips, therefore there is no reason for you send CRA any supporting documents unless they specifically request them.
