You can watch titles in Ultra HD if your device, plan, and connection speed support it. If you meet Ultra HD requirements but are not seeing Ultra HD titles when you browse Netflix, follow the troubleshooting steps for your device below.
To watch titles in Ultra HD, you may need to change the video resolution setting on your device. Follow these steps to change the setting:
From the Amazon home, screen go to Settings > Display & Sounds > Display.
Open the Video Resolution section.
Select the Auto (up to 4K Ultra HD) option.
Try Netflix again.
Your computer may be missing an extension required for Ultra HD 4K playback.
Navigate to Microsoft's HEVC Video Extensions page.
If a dialog box appears, select Open Microsoft Store, then select Get again.
Once the extension has successfully downloaded, try Netflix.