Hello Just Lisa Now,

I have done some research since posting my question about encrypted file transfer, and have learned a lot.  I have chosen your response as "Best Answer" and plan to move forward with the Encyro Pro paid version, but I do also appreciate the comments received from Jim from Ohio and sjrcpa as well.

I looked into the details about Encyro, Intuit Link, Canopy, Dropbox for Business, ShareFile, and TitanFile. The last four of these had higher prices for what I need.  I thought the Intuit Link service might be more confusing for some of my clients to use, and it is connected to the ProSeries software in a way that could actually be inconvenient in some ways; but it is FREE which is always good.

The free "Essential" version of Encyro was inadequate for my purposes, but I liked the Encyro "Pro" version because it does not require signup by the clients to send documents to me, it offers unlimited e-sign processing, I can use my brand on the transmissions, I will know when the clients read or download messages, and it is fairly affordable at about $120 per year at this time.  We'll see how this goes after I actually get started using it.

Thank you for helping me get started with this important service for my clients!

Ekhaterina