Hallo @stone3
Welcome to the IPFire community.
This post has a tutorial on connecting with the OpenVPN Connect App.
It may no longer be fully working as the OpenVPN Connect App has removed the use of the .p12 container to hold the key and the pem files.
This more recent post also has a user that got the OpenVPN Connect App connection working.
That user, @ritchie might be able to help you with more details of the steps they took to achieve that.