how to download a big playlist on apple watch

I use Deezer and I have only one playlist with over 1800 songs. I want to download this playlist to my device, so I go to Offline Mode, then to Add/Remove. After that, I see the list of playlists. I select my playlist and click the download button.

It shows “Downloading 0%” for a few seconds, but then nothing changes, and the button goes back to normal.

Can you explain how to do it, or tell me if it’s even possible?
My device has 19 GB of free space