Inside your Gerber file you are missing XY coordinates and a few other things. Compare it to an artwork file that works. You will see what I see. I did try to re-import your file back into the PCB editor. During import it stated "no photoplot file specified. Due I think to the missing stuff. Try just adding a shape fill to layer "Board geometry - Bottom Solder mask" over the entire bottom of your board and rerun your artwork.That should work for you. I just did the same thing to verify the results. Good Luck
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