Collaborative Playlist not working

[paulrobert]

Hi, 

I created a playlist and turn this as collaborative and shared with my friends, but they can't add a music on this playlist (they're reported that followed the playlist after open the shared link, but when search a music and select the option "Add to playlist", the shared playlist doesn't appear as option to add that music).

How to proceed about this? Is there some limitation to free accounts?

Thank you!

Best Regards.