Replace /dev/
in serial path with /hostdevices/
Example:
[mcu]
serial: /dev/some/path
pin_map: arduino
becomes
[mcu]
serial: /hostdevices/some/path
pin_map: arduino
[virtual_sdcard]
path: /opt/storage/uploads/
[gcode_macro REFRESH_SD_CARD]
gcode:
M20
M21