L1 Linux Player VPN Config file

How do I download the VPN Config file to a USB flash drive. What is the file format? I have Mullvad VPN in addition to Surfshark.
The BuzzTV L1 Linux Player has only 1 USB port.

You can get a cheap 4 to 1 USB A hub from Amazon or Walmart to connect a couple of jump drives and a keyboard.
You’ll probably need to use a file manager to hand the config file.

According to BuzzTV, the L1 Linux Player does not provide a UI to enable using a keyboard.