How to add songs to a playlist on playtube?

I just downloaded the app playtube on my iPhone, and I'm trying to figure out how to add songs to a playlist? I've created the playlist, but I'm stuck on how to add songs to it!

If you go to the cached section on "playlists" you can see a blue arrow next to all the videos you have watched. You tap on the arrow and it will come up with a few options including the add to playlist button.

Keep in mind you need to have watched these videos so they could be cached onto the app. And from there you are able to add them to a playlist

Playtube is one of my favorite apps.

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