tried example widget clipboard viewer.py,
I found that sometimes it could not detect clipboard text after copy sth in slide-over screen, in Today widget
slide-over screen, left swipe at right border
seems need time. add time.sleep(1) and it's ok now.
https://forum.omz-software.com/topic/3095/today-widget-get-print-working That should work. I found that in some cases (pretty rare), the widget script doesn't run automatically when you pull down Notification Center, and you may have to tap the run button in the widget manually (the triangle is not a logo). I'm not sure why this happens.