iXpand Mini Transfer from iPhone X not Viewable on PC

I transferred about 25 video that were taken on my iPhone 10 via the iXpand Mini with limited success.  A little less than half transferred in a format that could be viewed on a PC, while most only transferred audio.  I deleted everything and only tried to transfer the most important video thinking that was the problem, but it was not.  Any ideas?   I HAVE to get these transferred to PC then USB, going through a divorce and the court is needing the video.

Thanks in advance!

Can you not transfer/copy them to your PC via iTunes?