This was my 3rd attempt to buy a flash drive that "automatically" backs up photos and videos to my iPhone XS and my 2nd attempt to use Y Disk, a software you need to download Start automatic backup. Other flash drives saved photos just fine, but videos didn't save automatically. To my surprise, I was able to initiate a video backup on that flash drive. I'm not entirely sure I can tell you how I made it, but I did it! I think Y Disk is a little clunky and could use some improvement hence only 4 stars for ease of use. All in all, I think this is a very cost-effective way to backup iPhone photos and videos.
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