Adding audio to others question types

Hello, I would like to add audio to others question types than Slides, like Short Answers. It works on the Slides when I enable the Audio App. But I don't see any content types relative to the question types, in order to add the audio field. ( Structure > Content Types ) Where are the Questions Content Types ? In Opigno 1.17, I can see all the questions types but not anymore in the versions 1.18 and 1.19. Thank you in advance, Arnaud