I have formatted a microSD card in the device as “portable memory” according to your instructions. After removing and reinserting it, it is recognized as an “SD card” with the request to set it up, i.e. to reformat it.
After reformatting, the card worked at first, but when I reconnected it, I could no longer transfer data from the PC to the card.
After a restart I have the same problem as described above - request to reformat.
The card works perfectly in the card reader on the PC and all the data is still there!
The card is a Kingston Canvas Select Plus microSDXC Card 128GB
Is this a hardware or software error?