You can importany URL <x id="START_LINK"/>supported by youtube-dl<x id="CLOSE_LINK"/> or URL that points to a media file. You should make sureyou have diffusion rights over the content it points to, otherwise it could cause legal trouble to yourself and yourinstance.
You can also synchronize a remotechannel in <x id="START_LINK" ctype="x-a" equiv-text="<a routerLink="/my-library/video-channel-syncs">"/>your library<x id="CLOSE_LINK" ctype="x-a" equiv-text="</a>"/>