Question why cant I show vertex color in unity

made this .fbx model in blender and bake normals into vertex color:

Dosent it mean I painted vertex color in model succefully??
this is shader in unity for showing vertex color:

but when I drag the material to the model, it...disappears???

try in graph:

shows grey:

few months ago, I tried to paint character face outline mask in vertex color in 3d max and blender but acted the same as now...
So why???

 

here is something in blender and model in .7z

 

I don't see vertex colors saved in your fbx file.

 

so how to save in blender

 

forgot to change language.. what's wrong with the process, bake vertex color and export .fbx , is there any other steps???

 

Sorry I don't know how to do this with blender, but I can tell you for sure there were no vertex colors saved in that FBX.

 

ok,thanks