Hi there,
The broadcast feature only works while you are connected to the internet, but there are a couple of ways you could record a video offline.
One is to record your session as FITS files and then replay it later and use the native broadcast feature on the replay, or...
Because you will also have Open Broadcaster installed along with the Infinity software, you can use that directly to record a screen capture during your session, no internet necessary, and upload the video when you're back in civilization. This would probably be my first choice, personally.
We have talked briefly about adding a native, offline, video recording feature before - if it's something a lot of people would be interested in, we could add it to our list?
I hope that helps,
Jo