Thanks for that link, Scott. Hadn't seen that video but it expresses my objectives well. The video also gave me some ideas on how to use Drop Box with other folks.

I have already bought Orpheus. The Hannspree is on the UPS truck for delivery today. So, tomorrow I should be able to begin the learning process with Android.

Had some email conversations with Maeve Lander, the developer of Orpheus. The software does not do what I had hoped re PDF files. Edits are layered over the original file and are not transportable to other PDF readers. That's the way most readers work. And, it's probably the way I would have done it if I were still writing code. But the software is still the best I've seen to meet the objectives I have.