Well this is sure embarrassing. After learning that I could upload files
from my laptop, I found that with the desktop machine, if I left it alone
after hitting the "ADD" button to upload, it would actually do the upload,
but it took almost 15 minutes!
So I rebooted the machine, and it's working fine again. I should have
thought of that in the first place, but was blaming it on Groups.io.
Anyway, thanks for your help on this.
73,
Ed - W4ELP
Ed - W4ELP