Plex Essentials - Unofficial App Store
If you've used Plex you'll know that "Channels" (found on the main menu) is in fact a method in which to access features which can be added to Plex which are not part of the core app. I think out of the box you can add features like BBC iPlayer and Youtube, which are must have's for any serious media center.
If you need more than this, like say for instance a "Channel" which allows you to forcefully update your library remotely, then the Unofficial App Store is the way to go.
More instructions on how to enable this are at this forum post:
https://forums.plex.tv/index.php/topic/25523-unsupported-as-in-totally-unofficial-appstore/
The installation is fairly easy, all the instructions are at the link above. After adding the unofficial app store I honestly couldn't work without it. For instance, I can access even more streamable services for channels here in the UK as well as other utilities to make Plex that little easier to use.
It's worth checking out.
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