Hi jgj417,
The support article If you can't watch or stream movies and TV shows in the Apple TV app outlines best practices and troubleshooting steps when content won't play. If you've already confirmed the software and OS are updated for each device you're trying to play on, proceed with:
"If the movie or TV show won't start playing
After each step, try to stream or download the movie or TV show again.
- Check the System Status page for service interruptions or check a third-party provider's website for any interruptions. If there are service interruptions, try to stream or watch the video later.
- If you're having trouble signing in with your Apple ID, you can reset your Apple ID password or learn how to get a verification code and sign in with two-factor authentication.
- If your cellular connection is poor, connect to Wi-Fi instead.*
- Try watching on a different device using the same Wi-Fi or cellular connection. If it doesn't work, contact your internet service provider to see if there's an issue with your network.
- If other people are using Apple TV+ or Apple TV channels, make sure it doesn't exceed the limits for streaming on multiple devices."
and
"If the video quality is bad or it stops playing
- If multiple people on your network are using the internet, your connection speed might slow down. Ask them to temporarily pause their internet activities.
- If you're using a smart TV or streaming device, turn it off and back on again. If you're using an Apple device, restart it.
- Tap or click the download button to try downloading the movie or TV show instead.*
* You can't download movies or TV shows to Apple TV, smart TVs, or streaming devices. You can download HDR content only to certain iPhone, iPad, and iPod touch models. You can't download 4K video content to any device."
If the concern continues and only affects this specific file, you may report the problem using the site Report a Problem.
Regards.