Ok, I submitted 3 bug reports, each time I varied my steps slightly. Hope this helps.

Here's the screenshot I announced in one of those reports.

I'm trying to record video on my D850, but when I press "Start recording video" the app freezes and becomes *extremely* slow after recovering (you can watch UI controls redrawing, that's how bad it is). Recording doesn't work at all.

This is with an Xperia Z4 tablet running Android 7.1.1. In its ...