Qsan XCubeNAS XN8012R Owner's Manual page 21

4. Install a LFF tray into the XCubeNAS.
Insert the loaded drive tray into the empty drive bay all the way to the back until the
carrier handle can be closed.
Push the disk drive lock from right to left to lock the drive tray.
TIP:
Make sure the tray is pushed in all the way, otherwise the drive might not
function properly.
5. Repeat the steps above to install all prepared drives.
13