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File Share on Network - Enabled file sharing and then went to Mac. It was listed in Shared and just had to "Connect As..." and type the password. After reboot of Shield, it stopped showing up. on my Mac To fix, had go to Shield, turn off and on the network share. Then load a new finder window and it's there. Had to once again Connect As... though it may be due to me not have checked remember password.

Adding Additional Space

Key consideration is get fast and reliable storage... some notes,

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storage/emulated/0/RetroArch/system/mame/roms/Wonder Boy in Monsterland/wbmlb.zip

Reference

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Timeline of gaming platforms - http://wwwcontent.youtubetime.com/watch?v=QMOmG6C-4A8time/interactive/0,31813,2029221,00.html