Select [Utility] - [Administrator] - [System Settings] - [User Box Setting] - [USB flash drive function settings], and set [Save Document] to ON to permit saving a file in a USB flash drive. To prevent data leakage, saving a file in a USB flash drive is prohibited by default.
When user authentication is enabled, select [Utility] - [Administrator] - [User Auth/Account Track] - [User Authentication Setting] - [User Registration], and permit saving a file in a USB flash drive for each registered user.
You can also perform the same operation by tapping [System] - [External Memory] - [Save] in User Box mode.
For details on option settings, refer to Storage Option Settings.
When you use files stored on the USB flash drive on the computer, just connect the USB flash drive to the USB port of the computer.