GL-AR300M
Firmware Version 3.201
My pivpn config looked like
[Interface]
PrivateKey = xxx
Address = 10.6.0.3/24
MTU = 1420
[Peer]
PublicKey = xxx
PresharedKey = xxx
Endpoint = xxx:51820
AllowedIPs = 0.0.0.0/0, ::0/0
I had to enter a „new line“ after line „ Address =“ and before „MTU =“.
With this minor change, I was able to import config file in the text-field!