Metallic map exporting black

[Artbenco]

Hi I have two metallic maps that I want to export out of Substance Painter. 

Below are three maps the first map is the metallic map of a door and the white specs are nails. So this map is working as it should. The second map (when exported) is totally black however the screenshot below clearly shows that there are areas of metal in the map but when I export it, unlike the door that shows the metal nails the second map only exports as having no metal in the model when it does. What am I doing wrong?  

[Cyril Dellenbach]

Hello @Artbenco,

I'll need more info to help you with this. What are your export presets? The screenshot sent is a preview of the Metallic or a mask? Can I have a screenshot of the entire screen? What's the resolution of the exported bitmaps?

Let me know,