MP3 player update, the good:

• Able to use Ventoy’s exFAT partition to play music.

• Ventoy able to boot some isos.

The bad:

• Most distros won’t boot for me.

• Unable to mount Ventoy’s exFAT partition from booted iso.

So in order to boot from Ventoy and also have persistent storage, one would need to have a separate partition, for that purpose it would seem.