I bought an OTG USB SD card reader so that I could view my trailcam pictures on my Samsung S6 while out in the woods. Well, I'm getting this error message and am unable to view the pictures. The card reader is FAT 32, and the files are coming up under a LOST.DIR file. I was able to email the pictures to myself, but with no connectivity in the woods, again that is useless. Anyone have any ideas as to how to fix this issue? Thanks for any help you can give.