Using Homey app outside local lan?

What is the best way of controlling your Homey from outside your home?

Is there a way to use the Homey Android/iOS app from outside your local network?
Or to control the flows from somewhere else, like a portal.
I tried this:
But I just get the message “Sorry, this Homey is not connected…”

Tips will be appreciated.

Just starting the app doesn’t work? Because it should just work.

The mobile app should just work outside?

When on WiFi:

When outside:

Well, if you have a data subscription with your mobile provider. …