Playlist added to my library, but unable to add songs to it

[hg_hg]

Plan

Free/Premium

Country

Device

Iphone 12

Operating System

(iOS 10, Android Oreo, Windows 10,etc.)

My Question or Issue

I saved a playlist from my old account to my current one. I am able to play it, I also downloaded it so its available when I am not connected to the internet. 
However, when I want to add a song to it I am unable to do so. I click on the song, then click on 'add to playlist' but this playlist is not listed there. I have deleted it from my library and saved it again, unfortunately did not help. 

[Amayy]

Hey there, welcome to the Spotify Community!

This looks like something related to the ownership of the playlist. See, if you save a playlist (heart, follow), you cannot add songs to it because you are not the one (not the account) who created it in the first place. The only way to add tracks/episodes to such a playlist is if it is made collaborative, more about that here. So, you can make the original playlist collaborative and invite your new account to be able to add items to it.

Instead of just saving the playlist, you can open the playlist in your new account and then click on the 3 dots to add the playlist to another playlist. Your playlist will then be duplicated and you can keep adding to it from your new account.

I hope that helps, let me know if you need anything else!