Video cut short when exporting to file
I'm trying to export a video from iMovie to a flash drive (blank 32 GB and 64 GB with other videos export from iMovie). The video is about 32 minutes long (4.81 GB, MPEG - 4 Movie). When I do, it cuts off the last couple minutes of video. Still shows as 32:06 but quits playing around 29 minutes (cuts off the last couple minutes).
I've exported file to desktop on MacBook without any issues. I've tried to drag that file to both flash drives but get this message: "The item “2022 Highlight Film.mp4” can’t be copied because it is too large for the volume’s format."
Any suggestions on either issue (video being cut short when exporting directly to flash drive or why I can't drag a 4.81 GB file onto a 32 or 64 GB flash drive)?