Layer pain't isn't late me paint. Isn't the UV the problem

Hi

I'm following the begginer tutorial (amzaing tool, thanks for it), everything has been working smooth untill I get to the brush part.

I'm usignt the FBX you guys provided.

I'm trying to paint the details in the oil lamp, create the paint layer and I have been trying to make it work. I haven't been able to make it to do as the video.

I restar the computer.

Any help. I will appriciated. Here is the project.