when browsing for photo/videos in photo app, only about 20% videos are showing up correctly, but others are just showing up blank (as attached). All videos can be played normally, and they are all on the same SD card. There are huge videos files that are showing up correctly, so I don't think it is the SD card speed issue (I'm using Sandisk extreme, 80Mbps)
Anyone knows what could be the reason? Thanks!