Format SD card has a problem.
It's using vfat this means we have a limitation of size of 4GB for FAT32.
If you have a qcow2, iso image , then you cannot upload on sdcard.
You need to change to ext4 to handle larger size of file that can be uploaded to sdcard.

There is an workaround where you can ...

In Settings --> hardware , there is no option to turn off leds , both from network activity.
The only way to do use CLI or terminal and turn off using

echo none > /sys/class/leds/led:g/trigger
echo 0 > /sys/class/leds/led:g/brightness

echo none > /sys/class/leds/led:y/trigger
echo 0 > /sys/class ...