Sprite component not shown

(Newbie here) I have a C++ class which selects a string from a list. Then I want to use the corresponding Actor blueprint to get the selected string and display the related 2D asset. To do so, I am using “Switch on String”, to connect each string with the corresponding asset, and “Add Paper Sprite Component”.
Once I compile the class, drag the blueprint in the 3D game world, and press play, I don’t see any asset. Do you have suggestions on why is that? Please let me know if you need more info!