Please add an option of adding pictures and pdf files to discussions or immersions.
I was thinking of adding a couple of commics to the immersions or some different page so that people can read text with pictures to get a better understanding of what is going on in the storry and to learn a few new words which otherwise would be hard to explain and memorise in english. Reading commics could also mqke the reader memorise the visual action of the word making it easier to memorize.
There definitely needs to be more variety when it comes to the immersion section. I even like to expand on your idea and suggest that duolingo should allow users to submit audio files and videos as well.