ADWEEK will be all over Cannes. Subscribe to unlock unlimited access to all our coverage and analysis. Apple’s short film “Welcome Home,” directed by Spike Jonze and starring FKA twigs as a beleaguered city dweller whose drab apartment becomes a colorful, shape-shifting oasis thanks to her HomePod device, is easily one of 2018’s most captivating ads so far. Now, we get a behind-the-scenes look at