Seeing nested folders from a dlna server?
I managed to register my Google account in this box. It was difficult with the very limited remote.

I installed BubblePnp from Playstore. I could not get it to play my media because the remote is so limited in function.

I have ordered a keyboard/mouse USB wireless to use. That should solve the issue.

But to my surprise, and delight, the standard media player now shows one level of folders. Not a complete solution but a big improvement.