I’m using Samsung EVO SD cards in 3 of these devices. Once they were formatted I have not had any issues. Make sure that your SD card is fully inserted, which due to the location is difficult. To “see” the card, go to the device menu, tap the gear icon and go to the storage management button. Tap it and it will show you the local storage and a symbol that looks like a paint roller that will allow you to format the card.