Can Not see Playlist on my Android streaming apps

I have two streaming apps on my Pixel Smartphone, WiiM, Audioengine.

Created a playlist of XMAS albums.

It is visible on my Synology NAS, and on Plex, however, when I open the apps I can not find the playlist to stream.

Why is the Playlist not showing up.

Thanks

Are you using the same account for the Android app, or possibly a managed user?
Playlists aren’t visible to other users unless specifically shared.

On both apps I can stream all music from Plex, all libraries are loadable, but no playlist. Playlist do not load.