Well, folks, that was fun... but now Upwork on the Brave browser is on an infinite Cloudflare human-verification loop that's causing the same problem... on Firefox, the Upwork/ Cloudflare captcha box wouldn't even load, but on Brave it loads, I check it, it says verification successful... and then it loops back and does it again.
It's definitely Upwork because I passed Cloudflare's own (exact same) verification page easily, just to see if there was anything they could do about it.
Cloudflare is no stranger to this problem, according to their forums, but I take it they don't have much they can do about it on their end. Web searches say UW has probably over-tightened their security. But when I talk to Support, all they keep parroting is that it's me.
So the wait resumes. Aaargh.
Will say that I'm still enjoying Brave, though. insert half a smile here