I want to read usb stick plugged on printerboard from Marlin

Basic Information:

Printer Model: Phoenix, own design
MCU / Printerboard: BTT Octopus V.1. - Creality Sonic pad
klippy.log (1.8 MB)
klippy.log

Describe your issue:

…I need to be able to read an USB stick plugged on my Octopus main board, from klipper, Moonraker, ad of course from sonic pad screen too, if possible, my problem is lack of knowledge, I think I must use virtual_sdcard, but I don’t know the way to do it, and I’m not able to find good information about, thanks in advance for your help