I use a 32gb PNY USB 3.0 in my Insignia Roku TV and works fine. As you will see in the above link, brand name is not really important, USB 2.0 and 3.0 should work, larger gb flash drives will not provide more time than the 90min rewind/pause feature.
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102