This tiny screw is easy to drop, which is another reason to install M.2 drives before putting your motherboard into the case.
Slowly lay the SSD flat and secure the mounting screw. This tiny screw is easy to drop, which is another reason to install M.2 drives before putting your motherboard into the case. Some high-end boards will have a small plastic tab you can just push to the side when installing a drive, and then slide back to hold the drive down.