tile palette preview Blank

I’m new on the unity. so I want to ask about my problem.
I was trying 2d gamekit and following tutorial .
but I find tile palette not show anything and I don’t know what is wrong and and how to fix it
and I also find the same problem when I try to make the new tile palette

This is fixed in the beta, and that fix will be back-ported to the LTS release. Check out this thread: Tiles in Tile Palette suddenly not visible?

it seems you right.