Error in access SD card

[CA_HeArc]

Dear all,
I'm using M5Stack Fire with firmware v1.9.8 and LoRa 868MHz module (blue one).
The programming through UIFlow was successful until now with some nice tests of

• ENV III sensor,
• NTP timing,
• LoRa init example,
• ...

I'm trying to access an SD card now to log the ENV III sensor data locally.

from m5stack import *
from m5ui import *
from uiflow import *

setScreenColor(0x222222)

with open('/sd/FileName.*', 'r') as fs:
  lcd.print((fs.read()), 0, 0, 0xffffff)

Unfortunately the example code hereunder gives me an error.

File "<string>", line 15, in <module> OSError: [Errno 19] ENODEV

The SD card is a SanDisk Extreme Pro 32Gb.

• I formatted it under Windows 11 into Fat32.
• I copied a single text file on it.
• I inserted it the pads facing up (same direction than the screen).

Could someone help me out in the debugging ?

Thanks in advance,
C.A.

[CA_HeArc]

Edit:
is there any limit in size for the SD cards ?
if so, what is it ?

Best regards,
C.A.