I am subscribed to Apple Tv but its not showing as it should on the firestick app - what have I done wrong?

No longer using the little apple tv box I used to have - but now using Apple TV on my Macs and also attempting to use on Firestick. I have a subscription but unfortunately the app on Firestick is not giving me what I have elsewhere?? I have several movies and home videos I have synced to the Apple TV App on my Mac but they are not showing on the Firestick App. So frustrating - what have I done wrong? Also, I used to see my music on it as well but now that doesn't appear either??