That would be cool, although I don’t know how useful it would actually be. I think the strength of InVision is the ability to quickly create prototypes that are good enough to show someone so that they can understand what you page/app intends to do without actually having the real functionality. We must remember that it is just a prototype and it’s not really necessary to get too detailed. Then again, I suppose it wouldn’t hurt to add embedded media as long as it doesn’t slow down the viewing experience. Perhaps they’ll add that functionality in the future!