Regardless of the method, films are large files. A standard high-definition movie can take up between 2GB and 5GB of space, while 4K films can exceed 10GB. Before downloading, check your iPad's available storage by going to . If your device is low on space, it may fail to download or cause the device to run slowly.
If you're already an iTunes user, you can download movies and TV shows directly onto your iPad from the iTunes Store.