how do i attach a drawing like in a maths question?

Question

shadowfiend · Answer

There should be an attach file button next to the equation button below the reply text box. However, you can't currently attach it directly to the question; you have to attach it to a reply. If you need to attach it to the question, I would post the question and then post a reply immediately with the relevant file attached.

anonymous · Answer

If you have sketched or written something to a piece of paper, you can scan or photograph the paper and then upload the image along with the answer.  Screen prints can also be saved to a file and then uploaded.