Adding folders to music playlist

Hello,
I find adding albums from my NAS to playlists very tedious. I am using the phone app, as the PC app is completely useless for that purpose. I tried to select a whole folder containing multiple albums, but it only took a few, and I have to manually enter ever single folder into the playlist.
Is there a way to make this process easier?
Thanks

@Guillaume

What you are doing now is the best way.