Android TV limits external storage. With root, you can bind mount:
How to Root XIAOMI Mi TV 4A Pro 32" device? - HardReset.info How to root XIAOMI Mi TV 4A Pro 32
Rooting the Xiaomi Mi TV 4A Pro 32" allows for deep system customization, such as removing pre-installed bloatware or installing custom operating systems. However, Xiaomi does not officially support rooting for Mi TV or Mi Box products. Xi.Express Rooting will erase all user data Android TV limits external storage
Go back to > Device Preferences > Developer Options and enable USB Debugging . Step 2: Unlock the Bootloader How to ROOT the Mi TV/Box? Does it support ROOT? - Xiaomi How to root XIAOMI Mi TV 4A Pro 32