Srt files for library not working, so no closed captions

Channels Apple TV
#1

My Apple TV 4K used to display closed captions for my library files that have srt file. It doesn’t work now. It does work on Fire TV Cube and Fire TV Stick. Is there a fix to correct this on the Apple TV 4K app?

#2

Here's the fix, I'm using it myself:

#3

I do not have access to TestFlight for Channels. I have used TestFlight for a different app. Can you send me an invitation code please.

#4
#5

Thank you! I got the Beta app and it’s working!

#6