Heavy Content Downloading (iOS)
If you have a large amount of content to download it may take quite a while to get everything you want on your device. The downloading process can be interrupted for various reasons. To ensure un-interrupted downloading, make sure the following conditions are met:
(1) Your device is connected to a WIFI network.
(2) Your device has a fair amount of battery remaining or is connected to a power source
(3) The app is running in the foreground (like in the image below). This will prevent iOS from auto-locking the screen and interrupting the download process.