Because tablets are thin and light, TF cards (Micro SD cards) are generally used, and the sockets are generally on the side, which is relatively small. Look carefully, there may be a cover, and you can't see the slot until you open it. Pay attention to the front and back when inserting. You can't insert it backwards. Just stick to it and don't pop it up. Pull it out if you want, and it will pop up when you press it hard.