Install Openvpn Connect from the Google Play store, then:

1. Download your openvpn configuration zip from the link.
   (for example. https://image.rayservers.com/ssl/vpn/example.zip).
2. Unzip it in the Android file manager.
3. Launch OpenVPN Connect.
4. Tap the 3 dots on the top right corner, tap import , tap import profile from sd card.
5. Navagate to your unzipped vpn directory, tap the one ending in .ovpn, tap Select.
6. Tap connect.

That's all folks!