What am I doing wrong?

Posted this earlier and it’s still pending. Purchased a San disk ultra flair flash drive 128gb. Transferred one 2.3 go film then tried to copy another file 4.3 go and it says it’s too big. Driveways I have 112gb unused. What am I missing here?

Did you reformat it? FAT32 will not support files larger than 4 GB. The drive should be formatted as exFAT.