Inserting SIM and SD Card in Galaxy S7 / S7 Edge - YouTube
Samsung Galaxy S7: How to Insert / Remove Micro SD Card - YouTube
Amazon.com: Samsung 256GB Micro SDXC EVO Plus Memory Card with Adapter Works with Samsung Galaxy S7, Tab S7+ Tablet, A21s Smartphone (MB-MC256KA) Bundle with (1) Everything But Stromboli SD, TF Card Reader :
Samsung Galaxy S7 won't let you install apps on the microSD card - Gearburn