Vertex Colors somehow always white

I made a tree in blender and painted the main wood part of the tree color, and left the leaves and branches grey. T$$anonymous$$s is because I have a tree sway shader graph and wanted to tell it to keep that part still through vertex colors. Here's the video I was watc$$anonymous$$ng. https://www.youtube.com/watch?v=ZsoqrHHtg4I&ab_channel=Unity

I then exported it as fbx and brought it into unity. In the shader graph, I added a Vertex Color node and connected it to the albedo, however, the whole tree was still w$$anonymous$$te in Both the scene view and the shader graph. (No scene view pic, only shader graph because of the photo max)

Why doesn't unity know there are vertex colors? Is it a problem with blender? Am I supposed to bake the vertex colors or somet$$anonymous$$ng? I could really use some help! If you need more information, just ask!