Typically negative copper layers should be avoided at all costs, and converted to Positive layers
From the Gerber format specifications:
"It is recommended output copper layers in positive. Power/ground planes in negative made sense in the 1970s and 1980s to get around the limitations in the vector photoplotters of that age but there is no longer any reason for negative today.
To convert a negative copper layer to positive, please go to the menu: Fabrication > Convert Negative Layer...
Here's a 30-second video demonstration - Convert Negative Layer :
From the Gerber format specifications:
Here's a 30-second video demonstration - Convert Negative Layer :
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