@MathieuBoonen I figured it out. Take the video then go into the photos app. Hit the top left share button and choose Save to Files at the bottom. There you can create and add to a folder. Then in 123 pick file, then On My Ipad, then the folder you created above.
But then after all that I found out the new 500 mb file limit is only for the web app and the iPad app is still stuck at 10 MB max attachment, which even at 720p is 10 seconds max!
With these new 50 megapixel cameras even photos are getting close to 10 MB so I hope this can be raised in the future?