I am using an HDHOMERUN, and a laptop with plex. The channels are there, the DVR is there, but I can’t get no live tv to work, and it doesn’t show up on the roku.
Live TV is currently only supported on iOS devices and Android TV.
Other devices are coming.
No, there is no timeline, Plex does not give timelines.
Click on FAQ and Support Articles up there ^^^^^^^^^^ at the top and search “Live TV”.
