Asus PN53 Series User Manual page 40

To install an M.2 SDD to the bottom cover
1. Remove the plastic film from the thermal pad.
2. Align and insert the 2280 M.2 SSD into its slot on the bottom cover.
3. Gently push down the 2280 M.2 SSD on top of the screw hole and
fasten it using one of the bundled 3mm round screws.
40 ASUS Mini PC PN Series