How does data consumption use for Airplay downloaded iTunes movies from iPad to Apple TV

I have downloaded movies from iTunes to my iPad. I purchased them and downloaded them directly. When I plug the iPad into my TV via HDMI there is no data consumption at all over the WAN source.

When I try to Airplay to an Apple TV 4K latest version, the same movie attempts to stream instead of playing from the local file.

I am trying to understand why the Apple TV forces the downloaded movie to stream instead of playing from the local copy on the iPad.

I'll add that I have everything setup on the same Home and logged in as the same iCloud account.

I understand that there is a DRM check necessary but why does it try to stream the entire time instead of play the local copy?

How does data consumption use for Airplay downloaded iTunes movies from iPad to Apple TV
 
 
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