So every once and a while I go with my father to his trailer and he has a TV there. We get little to no service there. We always bring a Wifi Hotspot (Even though theres no point). I also like to use the app ShowBox. If I download the movie through there, could I stream it through AllCast even though there is no internet connection? Just ShowBox app ------> Wifi Hotspot --------> Chromecast with out internet access?