@JonB, thanks for the example. It does work fine on my iPad as well. The syntax is essentially what I have in my code, with a ui.Button activating a photo capture in the background. I haven't had a ton of time to look at the possible differences.
I'll say this, though. The one thing that made things work in my fullscreen view, was having hide_title_bar=True. This was independent of having the console show/hide activity. If this points to anything in particular, let me know. If/when I have time to dig a bit more into it, I'll add a new post.