What is the Welcome Home Nature Friends application, how does it work?

According to the introduction of Ambassify, Welcome Home Nature Friends is a Communication app on the Android platform. There is currently a 1.2.6 version released on Mar 20, 2020, you can see the details below.

It is nice to see that you care about and take care of nature, just like us. In fact, we would love to welcome you to our “Welcome Home Nature” community.
Thanks to our app you can participate in fun and interesting campaigns to support nature and the animals around you. By participating in these campaigns, you can collect points. You can exchange these for fun rewards and useful gadgets that can help nature even more at home.
In addition, this app will undoubtedly give you new ideas and tips on how to welcome nature at home even better. The birds, chickens, rodents or rabbits in your garden or on your terrace will thank you!

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.