Hi all again,
I just wanted to rectify things with regard to uia. A few days ago and after upgrading to jaws2021, I stated that with uia, the control-down arrow would not show selected text on my braille display. Actually, the culprit is not uia, but pan of text paragraph, which I had turned on. I reactivated uia having disabled pan of text paragraph, and selection of text behaved as normal.
Just in case it may be helpful,