How to use free space or unallocated partition from booted ssd

Volumio 3 Issues?

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Hidevs! I would like to ask if it is possible to use extra space or unallocated partition from booted ssd?
I have 120gb western digital ssd here and i burn volumio os on it, and booting it and conigure, so i just want to know if can use the remaining space or unallocated partition on my ssd so i can transfer/move my music from pc to my rpi, and is there a way to recognize the file in webui.
Thanks.

You can put your music into /data/INTERNAL on the Pi.