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Sermon uploads are done by each church. We do not have any control over when or if they upload sermons.
This is not currently available. However, an all-new AC Central is in the works so this is something that could be considered once the initial work gets completed. What type of "local church requirements" are you needing to meet?
That is on the roadmap. We have a number of planned features which will require user registration and saved preferences. All of that will be down the road a ways due to limited budget.
A completely new AC Central system is in the works and it includes just that feature. It will likely be available late this summer.
A completely new AC Central system is in the works. Once it launches, likely late this summer, the web browser version will be nearly identical in look and functionality to the apps.
Video is not actually part of AC Central, yet. Video is being setup and delivered locally. And sound levels are controlled at each church. If you are having problems with low volume, please ask them to increase their audio output to the live stream (this applies to video and audio-only).
The system simply cannot handle the unprecedented demand we are experiencing during the coronavirus lockdown. We are doing what we can to increase server capacity and stability, but can't guarantee there will not continue to be problems for some users during peak times.
There is an update available now in the Play store that has a fix for this issue.
AC Central is designed to continue playing after the phone goes to sleep. You may have a problem with your specific device or a corrupted installation. Try the steps listed here: https://accentral.userecho.com/knowledge-bases/2/articles/166-general-app-troubleshooting
Regarding being unable to download on iOS, many people are confused about that. See if this addresses your issue: https://accentral.userecho.com/communities/1/topics/254-how-can-i-download-a-podcast-from-around-the-table
Customer support service by UserEcho
Stream volume is determined by the audio settings at the church. They need to adjust the output from their mixer which goes into their streaming computer's audio input.