Supported SD cards can be located here -
Mavic Mini - Specs, FAQs, Videos, Tutorials, Manuals - DJI
16 GB: SanDisk Extreme, Lexar 633x
32 GB: Samsung Pro Endurance, Samsung Evo Plus, SanDisk Industrial, Sandisk Extreme V30
A1, SanDisk Extreme V30
A2, SanDisk Extreme Pro V30
A1, SanDisk Extreme Pro V30
A2, Lexar 633x, Lexar 667x
64 GB: Samsung Pro Endurance, Samsung Evo Plus, SanDisk Extreme V30
A1, SanDisk Extreme V30
A2, Lexar 633x, Lexar 667x, Lexar 1000x, Lexar High Endurance, Toshiba EXCERIA M303 V30
A1, Netac Pro V30
A1
128 GB: Samsung Pro Plus, Samsung Evo Plus, SanDisk Extreme V30
A1, SanDisk Extreme V30
A2, SanDisk Extreme Plus V30
A1, SanDisk Extreme Plus V30
A2, Lexar 633x, Lexar 667x, Lexar 1000x, Lexar High Endurance, Toshiba EXCERIA M303 V30
A1, Netac Pro V30
A1
256 GB: SanDisk Extreme V30
A1, SanDisk Extreme V30
A2