I feel this is pretty elementary so Iam really surprised this hasn't been implemented yet. Being able to add multiple tracks at one time is a time saver thus being more efficient and I believe correct me if Im wrong that is what business is all about. So I feel like not having this implemented is literally working backwards...
Thank you for reaching out with your suggestion.
We can definitely see the value in being able to add tracks to playlists in bulk. As we continue to improve our platform, features, and services, we will certainly consider implementing this functionality.
Thanks again for sharing your valuable feedback!