You can add images when you embed it. You need to use the blue plus button up top to add them. I made a quick video:
https://www.youtube.com/watch?v=r6cOwNZDu-8
I have noticed that some versions of Tiled work better than others. The 1.0.1 works fine for me, but for other people, I think 0.18.0 is the best.