Arduino Dragino yun Shied file transfer to android app via wifi

Hi,
So i have an arduino uno and a dragino yun shield. my teammates and i from school decided to do info cache via WiFi i.e. sending files from the mounted USB stick on the yun to the android app on the same network. I want to find out if any one knows or has tried anything similar and if there's a limitation to getting this done.

Yun/Yun Shield Samba server (Windows share server)

Yun/Yun Shield NFS server

Web & FTP server Packages in Yun/Yun Shield