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Heres what I do from windows for the Mac build:
- rename the game.app file to nw.app - dont know if this is required, but i do it anyway.
- put steam_appid.txt file with the steam app id as the only contents into the folder with the nw.app
- Double click nw.app - should act as a folder. Navigate to: Contents/Resources/app.nw - this is essentially the same thing as the zip folder on the windows side of things.
- Copy the libsteam_api.dylib from the "osx32" folder of the "sdk/redistributable_bin" from the steam SDK into this folder.
- done! upload to steam as per usual.
Do you do that ContentPrep thing on the Mac before uploading it?