In windows if you need to access an external nvme/hdd/ssd/usb/etc...
connect to windows, verify it shows up in disk manager (win+x, k)

Open CMD as Administrator:
diskpart
list disk
select disk 2
list partition
select partition 1
assign letter=E
exit

PERMISSION DENIED! Right? Because it's FAT32 UEFI/EFI OS (ubuntu/etc).

Open Task Manager, Run New Task, Browse, Navigate to the Letter you chose, E in this case.
You will now be able to access it. FULL PERMISSIONS. :)