Is there a limitation or cool off period before a user can upload new audio?

I can add existing audio to a playlist just fine, but I cannot seem to upload and save new audio to either an existing playlist or a new playlist.

Thanks!

After digging around, it seems (or is at least implied) that the ability to upload new audio is unavailable for dirty freeloader peasant tier only available for paid members. I think? I am not sure as the site is rather... idiosyncratically labyrinthine on mobile