Just tried it
First the + side
* DLNA is supported
* DTS audio plays without transcoding
* subtitles are supported without transcoding / burning into the screen - (subs included in the .mkv container)
* You can upload files from your PC to Xbox One via
http://[IP of Xbox]:8080/ - You just drop them into the web-interface and it uploads them to your Xbox One
* There is an option how to use external drives (Just mount it or copy the content to the Xbox One)
* => Don´t know if there are any storage limitations. I copied a 800 MB mkv file via the web-interface
- side
* The DLNA server from PLEX had problems to load folders with many items in it. If I have just a couple of unwatched movies it loads and I can start the movie without any problems => Maybe someone can confirm this, or try another DLNA server ...
* I cannot fast-forward or rewind. Just play/pause