wellllllll… this is both embarrassing and a great mystery. Up until a month ago RW was uploading reasonably well. Then last night I wanted to upload for the first time this summer. As I wrote above, it didn’t work. AND I CHANGED NONE OF THE PUBLISHING SETTINGS since it had worked. None.
After all your help and the help of others I double-checked deeper into Cyberduck just to see if the exact settings matched.
They didn’t. There was an entirely different IP address.
I copied and pasted that into RW and… it works.
Zero clue why, when I had not been into publishing settings since last year with the old IP address, that this happened. It’s a great mystery. SMH
Thanks to all above for your gracious help to this clueless RW user.