[Layer Blend ERASE Mode Not Erasing Background When Exporting]

Thanks @walt.farrell. The vector file needs to have a transparent background (this is for a t-shirt), and I can't figure out why it is placing a solid white background. If I export to EPS and then open that EPS in Designer, it has the background. Very odd.

[Layer Blend ERASE Mode Not Erasing Background When Exporting]

Hi everyone. I am trying to create a grunge effect using only vectors (not raster textures). I have a vector of an apple, and a vector of some grunge marks. 

I grouped, copied and pasted the grunge vector on top of the apple image and set the layer blend mode to 'Erase.' 

Everything looks good in my native .afdesign file. However, whenever I try to export (to EPS, PDF, even PNG), I'm getting a solid white background, where the desired output is a transparent background (like it appears in my .afdesign). 

Any suggestions? I have attached my working file here. Thanks!

Joe

test.afdesign