Why can't plex cast as sinology videostation ?

server-dlna

#1

Hi, using plex from chrome.
If I want to cast a movie to kodi , kodi don't show upp just chromecast.

Same computer same chrome, but with synology videostation , I can choose how to cast.
chromecast
kodi(airplay)
kodi(dlna)

Why can't plex do this?