Port Forwarding Question

This is not a flashlight question, so that is why I am posting in his area. I bought a DVMEGA Cast, which is an AMBE3000 based Multimode IP radio for DMR, D-Star and Fusion, which are three digital modes used on amateur radio VHF/UHF bands. I also installed a DVMEGA DVstick 30, which, as I understand it, allows the DVMEGA Cast to act as a de facto server. I have installed BlueDV AMBE on my Samsung Galaxy S9 and I have been trying to connect to my DVMEGA Cast with the BlueDV AMBE, but I have been unsuccessful.

The directions are a bit unclear to me, but I think what I might need to do is configure my router to allow Port Forwarding, so that I can connect with the BlueDV AMBE Android app.

For those that are, or were, into networking, does that make sense and sound like something I should try?


http://www.dvmega.nl/dvmega/

https://www.gigaparts.com/dvmega-dvstick-30.html

https://play.google.com/store/apps/details?id=com.pa7lim.BlueDVAMBE&hl=en_US

I'm not familiar with IP radio broadcasting, but networking concepts I understand. A couple of questions:

Is the BlueDV AMBE just an app on your phone that allows you to use your phone like a radio microphone? If so, are you attempting to connect to the DVMEGA Cast while you're on the same network, or are you attempting to connect when you're outside of the network (like when you're using your data service on your phone)?