Thanks steje. That makes sense. I've used SAMBA to view and manage files between Windows, Linux, and even Mac machines for years. Macs, of course, also use Airplane.
In a bit of surfing since reading your reply I've found some options.
From a forum —
That's a good start.
From another forum —
On the Google play site there are a lot of SAMBA apps, which I have not tried to use or have any first hand knowledge about. One, Samba Filesharing, creates a WiFi server —
From a blog —
So there are some options to make the files on an Android cell phone SD card visible and manageable using D-Opus.