The Xiaomi 15 Ultra does not support expanded storage via an SD card. This means that you cannot add additional storage capacity to the device beyond its built-in storage options. However, the device comes in multiple storage configurations, including 512GB and 1TB, which should be sufficient for most needs, offering ample space for APPs, photos, videos, and other media. If you need more storage, cloud services can serve as alternatives to ensure that important data is safely stored and accessible.