Review on HiLetgo Stackable SD Card Shield Module with 📷 SD/TF/Micro SD Card Reader for Arduino UNO R3 MEGA2560 by Robert Gilbert

Was very glad it worked with the standard Arduino sketch. I looked at the traces on the board and the chip select is 4, looked at the sketch and it already had 4 since the chip select was already there. Mine has a switch for TF/SD. SD is for a full size SD slot while TF is for smaller SD cards. It requires no instructions, it works exactly as configured by default.