I’ve always been a Google files users. It’s easy and I really don’t use files enough to justify looking for an app to do it on my behalf. I did use Solid Explorer (paid) for sometime. And, Material Files (free) was recommend to me by a friend.
I like the idea of a Nothing theme though, it’s an interesting idea. Especially if they could bring benefits like speed.
I’d also suggest logging this as Nothing product feedback via your phone. Settings>system>feedback!