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Looks like you found a bug! When adding a chapter to a book filter, it only displays the blank screen. We'll squash this bug in a maintenance update in the near future.
Thanks for the your message. This feature is already there. Just touch the brown player bar at the bottom and it opens the Now Playing screen with progress bar and speed settings.
In the just-released AC Central 3.0 update, downloads are now managed on Android as they are in iOS. Progress on each file download is displayed in the app.
We now on a completely rebuilt apps running on a new server platform so all old requests will be reviewed again.
The previous app development which was referenced in our answer from a year ago was scrapped and a new app (v.3) was built which did not include this feature. But this is now planned for late 2021 or early 2022.
Customer support service by UserEcho
Another user also reported this. We will be looking into this issue on the apps and fix it in an upcoming maintenance update. As a workaround, you can access old sermons using the Advanced Filters in the web browser version at https://accentral.apostolicchristian.org