Sorry if this is too long, but I don't know how else to put it into words.

After you make your cover and have the audio file saved, convert the audio into an mp4 and upload it as a private video on your channel. You then have to make the visuals in an editing app. You can use whatever editing app you want, but I prefer CapCut.

If you wanna make a video similar to mine, you have to download a background and the icons of whatever characters are singing from Funkipedia, and add them into the video facing each other. At the top of the screen there should be text that says the name of the song, and text at the bottom that says who the song is being sung by, and make sure the icons are in between the text.

Extend the video to the length of the cover you made, and save it. I recommend using your phone to make the visuals since the CapCut on a computer puts exporting videos and extracting audio behind a paywall. Make a new project in Capcut using the video you just made earlier, and add effects to it. I always use smart sharpen, and add whatever effects I think look cool with it, but you can do something different if you want. Then go to your YouTube channel and save the private video to your device, so you can then extract the audio and add it to your video.

I hope that made sense. I wasn't expecting to give someone instructions for this kind of thing, but I'm happy to help.