Amazon Fire TV User Manual page 7

Port
MicroSD
Description
Connect a USB Device to Amazon Fire TV
Use a Keyboard or Mouse with Amazon Fire TV
On Amazon Fire TV (2nd Generation) you can expand
the storage space for games and apps up to 128GB by
adding a microSD card.
Use the microSD port to insert a compatible microSD
card (purchased separately).
For more information, go to
Fire TV (2nd Generation)
Not available on Amazon Fire TV (1st Generation).
MicroSD Storage for Amazon
7