Hi guys,
So another update for you. Been trying this out extensively today, and I think it's safe to say that this latest beta of iOS 12 has fixed my problems with the app and its connection with the camera. Same as yesterday, I have not once failed to establish a connection from the app to the camera. Viewing files works fine, though sometimes if you scrub too much ahead then it just buffers for a long time. Otherwise, file download speed still seems unsatisfactory for my liking (on 5GHz, using Samsung EVO+ 64GB card). The speeds are really inconsistent, too. For example, I once had it go from 0%-45% in 2-3 seconds, while other times it takes 2-3 seconds to go up 1%. I'm not sure if Viofo can improve the file transfer speeds, but I sure hope so. Each file is no bigger than 190MB, so it shouldn't be a big problem on 5GHz network. Other than that, the settings are applied correctly and instantly.
So far, I am happy with how the new beta is working with the dashcam. Just wishing for faster download speeds.