confused with importing pixel art sprite and it's PPU settings
Hi I'm new to Unity.
When I trying to import my 32 x 32 pixels sprite (made via Aseprite), I got a problem.
Each sprite in my importing sprite sheet is 32 x 32 pixels, So I expect to see them locate in 4 grids in my Unity scene, like I see in Aseprite editor (below). 
But when I set the import setting's PPU to 16, my sprite seems too small. 
I need to set PPU to 8 to meet my expectation.
Why is that?
Do I misunderstand something?
Thanks!
BTW,
1)My reference is this tutorial
https://www.youtube.com/watch?v=E9GilOgdW2M
2) My world grid setting is 1 for XYZ.
Thanks Again!
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