I want to download some music.

Hi ​@YusufK122 !

If a song is on a single, then you can download it.
But if the song is on an album, then you need to create a new playlist and put that one song on it.
Then you can download the playlist with one song.

There are 1500 songs in my playlist. I downloaded all of them. I added 50 more songs to my playlist. But I can't download the 50 songs I added to my playlist.

When I want to download songs that are not downloaded in my playlist, the download button at the top of the playlist is green.When I click Are you sure you want to remove "YusufK" from your downloads? gives a warning. 

If I'm not mistaken, when I add a song to a playlist, that song should automatically download. But it doesn't. 

​@YusufK122 try favoriting the song first

Unfortunately, it did not happen.