I used my computer to upload a mp4 file that I recorded, after uploading it to drop box, I wanted to save it to my IPhone X gallery. I can’t really save it, all I see is “Couldn’t save. Sorry, this type of video cannot be saved to this device” I’m really confused, I tried multiple times but it does not work. Oh and I can watch the video normally on the drop box app. I just can’t save it for some reason. What should I do?