Here are the best microSD cards for the Samsung Galaxy S9 & S9+
Samsung Pro Plus 256GB MicroSD Class 10 UHS-I Memory Card for Samsung Galaxy S20 FE 5G, S20 Ultra, S20, S20+, S10, S9 Phone - MB-MD256KA Bundle with Everything But Stromboli Micro SD
MicroSDHC EVO Plus Memory Card w/ Adapter 32GB (2017 Model) Memory & Storage - MB-MC32GA/AM | Samsung US
Transcend MicroSD HC 32GB Memory + Adapter for Samsung S9, S8, S7, S10, S10+ | eBay
Aocarmo Single/dual Metal Plastic Nano Sim Card Tray Micro Sd Slot Holder For Samsung Galaxy S9 / S9 Plus S9+ - Sim/sd Card Trays - AliExpress
Samsung Galaxy S9 / S9 Plus SIM Card & Micro SD How to Insert or Remove - YouTube
Samsung Galaxy S9 Tips - How to Save Images to a MicroSD Card - YouTube
Samsung Pro Plus 256GB MicroSD Class 10 UHS-I Memory Card for Samsung Galaxy S20 FE 5G, S20 Ultra, S20, S20+, S10, S9 Phone - MB-MD256KA Bundle with Everything But Stromboli Micro SD
Best microSD cards for Galaxy S9 in 2022 | Android Central
Does Samsung Galaxy S9/ S9 plus have a microSD slot
128GB Micro SD Memory Card For Samsung Galaxy S9 9+ Plus Mobile Phone 7426996623192 | eBay