Thanks for your latest e-reply, Ben:
Following your suggestion, I open my user-library folder's Launch Agents folder. In it is one Adobe "list" file that I don't recognize, as follows:

Should I be concerned with it (or the other two Google "list" files)?
. . .
Regarding your latest concern regarding the Western Digital entry, only my daily OS backups were copied onto the external hard drives. I did not access any applications or files from the two external hard drives. Incidentally, I deleted that entry from the automatic login pane; the pane is now completely empty.
I requested tech support yesterday but have yet to receive a response. I prefer to wait until I connect personally with a technician before I attempt a workaround that sets up an alternate user from which to access Adobe DW and its files.
Before I click "Post," may I ask if you, Nancy, or another has forwarded the .zxp file (linked above) that Nancy asked me to create? Might I need to do something more, Ben or Nancy, regarding that request?
Thanks, again, Ben!
Wondering Warren
Update:
Adobe technician, Nayan, was unable to solve the problem. He didn't feel that it was an Adobe CC problem.
I learned, last night, from my host/server that this was a server-side problem needing to be corrected. He told me, "We have tried to configure the passive FTP port range on the server end and found that it is not working as expected."
No correction as yet. Been unable to access and/or upload modified files for seven days.
I thank you — Nancy and Ben — for the attention and assistance you provided (as you usually do).
Warren