A 6-digit key is security key to share files and uses only one time in 10 minutes.
Once you use a 6-digit Key to receive files or after 10 minutes, the security key expires.
How to send files
1. Select files or folders you want to send.
2. Tap 'Send' at the bottom.
3. Created the 6-digit key.
4. Send the 6-digit key to the receiver.
5. In the 'Receive', enter the 6-digit key and the transfer will start.
※ Because sending files in real time, when sender or receiver stop sending files, it will be canceled.