How to Submit This?

[dauntingmountain]

I've ripped sprites from a game that uses a fourth channel as a mask for color customization. When converted to PNG, the fourth channel is used as opacity: 
   
With the opacity corrected and the mask isolated:
       

How should I submit them to the Spriter's Resource?

1. Two separate sheets, like SchoolGirl & SchoolGirl_Mask
   
2. One sheet with the mask sheet appended below / beside the other?
   
3. A zip with both sheets
   

Thank you for your feedback