We have tested with cards up to 256 GB but technically there is no reason why larger cards won’t work. Though you have to reformat your SD-card to FAT32 for 64GB and larger cards. Note: Windows will not allow you to format an SD card of larger than 32 GB in FAT32, use an external tool to format. For macOS users, select FAT format (which is FAT32) in the Disk Utility app.