Cannot copy video from my iPhone to iXpand

I purchased a 256GB iXpand Flash Drive Go to help move full-length video files from my iPhone 11 to my Mac. These are on my iPhone (not iCloud files). Because they are large files, I have read and performed the suggested Disk Utility fix to erase and format my iXpand to the exFAT file system. After several hours it still has not done anything. Am I giving up too soon or is there something I am doing wrong?

I tested moving just a regular photo and it worked just fine.

Thank you!