add media is missing except with admin (Q&A)

Hi. I'm facing an issue. I want the users to be able to add media to the questions or answer.

Logged in as the admin I have that option and it works perfectly (publishes without problems) but when I log in as a subscriber that option disappears. Why? How can I make it so that when they register they have that option too?

See attached screenshots. The one on the right is a screenshot while I'm logged in as admin - on the left as a subscriber. Subscriber capabilities: View questions, submit question, Edit own questions, Delete own questions, Subscribe to new questions, view answers, add answers, edit own answers...

Any ideas?

Thanks.