Largest possible USB drive for fire stick 4k?

I want to expand the memory on several of my fire stick 4K (not max)… I have purchased the OTG cables needed, but I would like to know the largest USB stick size I can use. I have read conflicting results from anywhere between 64 KB and 256 KB, and that the sticks must be formatted in FAT32. Any help will be greatly appreciated. Also, one of my TVs is a fire TV can it be expanded with a stick?Thank you.


This is from Amazon


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