I am having the same problem and it's driving me NUTS. I just got a new tablet and I can't download content. "Failure to download xxxxxxx. Check your internet connection."
I just downloaded the app, so it's not an update issue. I have a Samsung Galaxy Tab S4 running Android 8.1. I would *really* like to be able to access my scriptures

on a screen bigger than my phone. I've read every suggestion, Googled every search term combination I can think of, tried everything listed on other threads, and... nada.