2.83: Snapping to edge not working correctly In the above image, these two planes are same mesh. I want to stick both with snap to edge at the red line in the below image.

However, when I tried to choose the vertical one in edit mode and put G key to do that, it failed like the below image.

So, will someone teach me how to snap correctly? Thanks.
Is the setting properlly?

It will snap to edge, all length of edge. It shouldn't align it for you since not all edge are in same length
So Snap it to the corner

And if you give additional axis constraints, (eg. lock to x-y plane), it might be more buggy to align on. Not sure it's intentionally designed or just a bug.