Plex provied extra clips, have to transcode?

Hey team, sorry if this is an easy question but I have been using Plex for years but I just cant work this out.

When you are on a movies and you go the the Plex provied extras, like a trailer or behind the scenes clip it always trancodes for me for slme reason. It looks to be 1080p I dont know where these files stream from ie youtube or whatever. Can anyone help with a breakdown on how this works.

Here im using an apple tv4k at one house and the server is at another.

Heres a screen shot of a clip playing.

And here is a screen shot of the movie playing
With it streaming fine.

I dont see why clips that are hosted external to my server need to run via it then get transcode im missing something here :confused: any help would be great.

Yeah, I dread when I load up plex-provided trailers, as it fails to even PLAY half the time, and the other half it is obviously transcoding since it takes 5 or more seconds before it starts.