I had no luck using the KODI plug in. SSH in with PuTTY or a similar “Telnet” program and run the commands from the command line.
Here’s my four month battle with the GUI: OpenVPN to my home router - #6 by Smacaroni
Since I control both ends of the VPN, the fact that I couldn’t make it work tells me it’s less likely that you’ll have any success when you can only see and modify one end.
Mine reconnects to the VPN if the connection, not the network, is interrupted. In my case, it can not access any files without the VPN, so I can’t answer your other questions.