My Android tablet is being passed around some clients of mine, and due to confidentiality, I cannot allow the different companies to access each others files.
As such, I have created different user accounts on the tablet (Android 8.1), one for each company. Their access is limited, and as such they cannot access the built-in File Manager.
But how do I make sure they cannot simply plug the tablet to a PC and access all files through the mass storage? Preferably, they shouldn't be able to access anything stored on the phone.
The tablet isn't rooted.
I'm desperate for a solution. I have looked into disabling the USB port (Link 1, Link 2) without luck. Using multiple tablets is not an option either, as each client isn't allowed to look at their own files (for protection of IP). Please advice.