It has 8 GB internal memory and 32 GB expandable storage slot. (themobileindian.com)
This phone rocks a Qualcomm Snapdragon 821 Flagship SoC, 64 GB OnBoard Memory with Expandable Storage slot, 4 GB RAM and a 2300mAh Battery. (gizcentral.com)
The Redmi Note 5 series does not have a dedicated expandable storage slot like the Redmi Y1 phones. (indianexpress.com)