If the Xiaomi phone cannot recognize the SD card, please follow these troubleshooting steps:
1. Check whether the SD card’s capacity exceeds the device's maximum supported capacity.
2. Xiaomi phones support FAT32 file systems. Devices running Android 6.0 or above (including Xiaomi phones, REDMI phones, Xiaomi pads, and some third-party phones) also support exFAT. If the SD card is in an unsupported format, connect it to a computer via a card reader and reformat it with a supported file system (check device specifications to see if exFAT is supported).
3. If the SD card is reported as damaged, you can also try reformatting it.
4. If the above steps do not resolve the issue, replace the SD card with a new one.
Note:
SD cards with a capacity greater than 32 GB cannot be directly formatted to the FAT32 file system in Windows. Third-party disk partitioning software can be required to perform this task.