Problems.jpg.txt.avi

I had a few problems this week when I tried to do that:
1)
When I just drag the file to my desktop it only copies around 4.3GB across (which is significant because 2^32 is 4294967296 and the FAT32 *write* limit is 4.3GB) although that shouldn't matter since my SD card is formatted with exFAT which has a max file size 16EB of because it's bigger than 32GB and my phone supposedly supports SD cards up to 64GB (I was thinking it could have been possible that my phone fcked up formatting the SD card and did it with FAT32 because it might've only supported 32GB sd cards, but no it did it with exFAT). Also ext4 does have a smaller file limit, but it's still 16TB

2)
When I try to clone the damn file using dd, it says the file is locked - not much else to say here

3)
When I took the SD card out of my phone and into a USB to microSD card reader, I get an error saying that the filesystem is bigger than the underlying device, implying the formatting is fcked, but it's read fine when it's in my phone


TL;DR kinda confused so I'm doing it the long way and it's done 6.8GB so far