Adding mp3 files to playlist on Apple Music

\Good evening,

It has been a long time since I had to do this...probably before iTunes was kicked to the curb.

I am trying to add an mp3 file to a playlist that is in my Cloud Music Library (which means I can play it on my phone, Mac, etc.). I read online that I first must add the mp3 file to my music library, which I did, and then I tried to add it to a playlist, and it still is giving me the same error message that if I add it, the playlist will be removed from the Cloud, and I wouldn't be able to access it on my iPhone.

Is there any other way I could do this without having to remove the playlist from the Cloud?

Regards,

mdp1101