Music apps won't play with games on Series X

They haven't announced what the Series X will do yet.

However on the XB1 you don't play locally stored music, but can stream it from multiple sources (including your own file shares on your network).

There are various apps in the store that let you play music

The games on the SSD will run fine on it. You won't need to move them to the Xbox Series X storage to play them. Only the Xbox Series X games & games optimized for Series X will need to be played on the consoles own storage.

I'm assuming you're asking about the Series S and X not the One S and X?

If that is the case, if you have any games on discs you want to keep playing, get the Series X. You won't be able to play them on a Series S. Otherwise, the Series S is a little lower quality, but would be fine for casual gaming.

If he has a Series S/X and is trying to play a Series S/X optimized game, it will only run on the internal drive or on an expansion card made for the Series S/X. It won't run on a regular external hard drive or SSD.

I use USB thumb drive to connect to Series console and capable to play music via Music Player app, this is another music app. Since I have Groove app already installed, still cannot navigate my local music from external thumb.

I assume that Groove is capable to play music without the need of external drive and still playing in background while doing multitask on console.

Unfortunately, although Music Player app has capable to play music, it requires that thumb drive must be connected to console and no way to transfer local music to internal drive at all. Plus the app must be active, doing multitask on console will result in stopping music.

The question, is there a way to use Groove to play music for Series console in my end? If not due to discontinued, what's the point of Groove's availability in my end that yet I still cannot play music?