Need help understanding the affect bitrate has on quality

[TheDreadPirate]

However fast your mobile connection can sustain. A raw 4K HDR video is like 50-80 Mbps. And that needs to be a fast and stable mobile connection.

And then you need to consider data caps, either absolute data caps where you starting paying more or "3G speeds after you hit this limit" type of caps.

Auto should adjust the max data rate according to your network performance, but it only performs the network speed test when you start the video.

IMO, 5-10Mbps is probably a good cap for a consistent mobile experience.