Problems with the app for Apple TV and Firestick

I tried the app for Apple TV today and it has several problems.

I definitely don't have a recent apple tv (it's not 4k) but the FHD Channel streams are not played (you only hear the audio and you can't see the images), it's not possible to choose on the channel which stream to watch (FHD, HD, SD) as on the firestick and there's not even the setting to be able to choose the quality of the channels with which they want to be played.

In Italian, the translation of the Series is also incorrect (it is translated as TV Programs).

While on Firestick I can't find how not to show trending movies and series (since they are then connected to an external server and therefore are not in my subscription).

I also wonder how the app can be updated on the Firestick because it seems to me that I have not found any dedicated menu and since it is not downloaded from the store it will not update automatically.