In a diagram view and within a symbol, you can add annotation and picture. These commands are described in the Drafting User's Guide.
About Annotations, Text Properties, Text Templates and Arrows About Frame Color Fills and Margins About Sketching Assistant Creating Texts Creating Arrows Creating a Table Copying Table Content Creating a Text With a Leader Instantiating Table Templates Instantiating a Label Creating Balloons Inserting a Knowledge Report in a Representation Managing Text Mobility and Edition Inserting a Picture