Apple TV: Why is there an alert icon next to Apple TV in the iTunes device list?
Summary
Music or movies in your iTunes Library that are in a format not supported by Apple TV will not be transferred to your Apple TV when syncing. When this occurs a triangle with an exclamation mark appears next to the Apple TV icon in the iTunes Device list.
Products Affected
AppleTV
Click once on the triangle icon and a dialog will appear explaining which content was unable to be synced along with a brief description.
See this article to learn more about audio or video formats supported by Apple TV.
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