I never could find an elegant solution for video, but I do use Easy Voice Recorder on Android. Records audio only on a locked phone and streams it to your Google Drive. I've used it in a pinch a couple of times and it's performed perfectly. I keep looking for the video version of the same thing but alas....haven't found it. Anyway, it really is a fantastic, free app.
Interesting, I use PiHole as well and have no issues with any of my Roku devices. I wonder if you have more restrictive blocking or some particular rule that I don't. What lists are you using in PiHole?
I never could find an elegant solution for video, but I do use Easy Voice Recorder on Android. Records audio only on a locked phone and streams it to your Google Drive. I've used it in a pinch a couple of times and it's performed perfectly. I keep looking for the video version of the same thing but alas....haven't found it. Anyway, it really is a fantastic, free app.