Apple TV app
My Apple TV app has downloaded videos in it by default. None of them play when mirroring to a smart tv. All my other pictures and videos play while mirroring. Also all the videos in Apple TV app play on the phone fine.
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Do you have an AirPlay receiving device? Apple TV box or AirPlay-enabled smart TV? Mirroring options other than AirPlay may not be supported for Apple TV content.
Use AirPlay to stream video or mirror the screen of your iPhone, iPad, or iPod touch - Apple Support
If screen mirroring or streaming isn't working on your AirPlay-compatible device - Apple Support