Thanks so much again for all the responses!
Gail from Maine: after viewing your last response, I was able to solve the problem!
The kindle was supposed to appear on the desktop, (from everything I read) after being plugged into the computer,
as an "kindle icon"- similar to how a flash drive apears on a desktop. I realized this must the case for the
older versions and apparently not for my new one. This brings me to markwmsn:
Thanks also for your repsonses! I realized that the Android File Transfer box that appears must have replaced
the kindle icon from earlier versions. I was able to then move files into the appropriate folders through that
file transfer page. I kept expecting the kindle to show up on my desktop--it never did--and now I know
why. I still can't "eject it safely" after transfering files since it doesn't show up as device on my desktop--
but I do not get an error message either.
Your last few responses put it together for me and now it works- finally!
I think I had to "re-train" my "Apple" brain!
Thanks so much again!