Adding music on YouTube?

So I made my first YouTube video and I added one of the songs provided by YouTube and added it to my video. After saving it, I rewatched the video to see how it was and the song I put in there wasn't playing.

So, I thought maybe I really didn't save it and tried to go back into the editor to put it in, and when it opened, all the editing tools were there except for the audio tools.

Why? And how can I fix this? Is the audio being added/processed and is taking a while? If so, how can I know when it's done?

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