I can’t get the quick note swipe up feature to work on my new IPad Pro (5th gen)

The Quick Note gesture is a diagonal swipe - from either the bottom-left or bottom-right - towards the centre of the screen. Ensure that you have enabled the chosen gesture in iPad settings:

Settings > General > Gestures > [Corner Gestures] Allow Finger to Swipe From Corner - set to ON

Next, tap the corner gesture of choice - and choose between Quick Note, Screenshot or OFF:

It's not exactly a swipe up. Read this link to learn how to do it:

https://readdle.com/blog/how-to-quick-note-ipad