OTG for firestick 4k

When using 128gb flash drive for firestick 4k should it be formatted with FAT32 ,ex FAT of NTFS ?

Really no one here knows the answer to this? Many thanks to anyone who can help me with this.
Maybe Troy can chime in as I know he has the answer.
Thank you to all that have looked at the thread but could not help. :smiley:

Fat 32, or at least that’s what I think. See YouTube.