Hi,
Try using an old credit card to release the tabs carefully without breaking them, there's a picture in this thread for you to see the inside:https://community.acer.com/t5/Swift-Spin-S-and-R-Series/Does-the-Acer-Spin-3-have-a-spare-m-2-or-msata-slot-for-a-SSD/td-p/468603