Export substance texture

I can’t seem to export the diffuse texture from my substance textures, even using the export option. The diffuse texture is almost entirely transparent, like smoke. Any ideas on this?

Sorry, I should have specified, I’m not using substance designer, I am using substances I have purchased, using the export drop down.

The transparency in the texture is because the specular is stored in the alpha channel of the texture. It may create issue if you are exporting as png files since transparency in PNG is very badly handled by Photoshop.