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No, I just click on them or run them in mpv. I've thought about writing a plugin for TTRss where you can give it a channel name and it will add the RSS feed, plus store the channel's icon instead of the YouTube icon, but I haven't gotten around to looking at that (or seeing if there's a plugin that already does some or all of that).

Subcribe to: https://www.youtube.com/feeds/videos.xml?user=USERNAME or https://www.youtube.com/feeds/videos.xml?channel_id=CHANNELI...

and enable plugin af_youtube_embed

Yes, I'm using the https://www.youtube.com/feeds/videos.xml?channel_id=CHANNELI... format with af_youtube_embed enabled and it is just showing blank entries on the newest version of ttrs & plugins. Looks like my installation is bugged then, but I don't have the time to investigate at the moment.

You can always just use youtube-dl and sync local copies of the channel