This feature will be updated soon by musing team as they are working very actively and recently they have updated the answers writing section of editing and they have also given the image URL where you can use the image URL link and upload in the musing answers to determine what the answer is and what is the content about.

So they are updating their website regularly and making their site very innovative and must say i love the team of musing as they are making their users very happy.

I have not found other site like this in my online field so no need to worry they will update their app soon and there will be question editing section also soon.

But i want to ask what you will do after editing your question? Because question cannot be make innovated and looks beautiful as answer look.