The iOS and Android app both include your SpiderOak Hive folder. If you have files in SpiderOak Hive, you will see this data first upon mobile app login. If you've opted out of using SpiderOak Hive, then you will see the data associated with the first computer you set up in your account.
Please note that you can only view files in your Hive at this time. You cannot upload or sync changes made on your mobile device.