Sandisk ultra flash drive 128 mb

I downloaded some MP4 video files from my GoPro 8 to my Iphone IOS. When I try to copy these to my flash drive I consistently get a “Operation Failed. Please try again” message which I have done numerous times with no success. I have deleted the APP and reinstalled it with the same outcome. Is there a bug with the GoPro files and is there an easy fix? I really wanted to store these GoPro videos on the Sandisk flash drive. Please advise. Thanks

Will someone be answering my question?

Hi @rbarber137,

Please contact the SD Technical Support team for best assistance and troubleshooting:
https://kb.sandisk.com/app/ask/