Hi,
I have an openvpn setup which works fine on command-line. I have a single file which contains inline keys.
When I try to import it on network-manager (not sure of the version, but I run Ubuntu 17.10), I have an error with message like "cannot read or does not contain known VPN data / ERROR : plugin does not handle import" (French message is : Le fichier xxx.ovpn est illisible ou ne contient pas d'information de connexion VPN reconnues. ERREUR : le greffon ne prend pas en charge la fonction d'importation).
I could not find anywhere a clear documentation about the needed file format.