Files doesn't show up on external HDD
Hello. I have a problem with my external HDD when I plug it into my Macbook. I am trying to transfer some files from my PC to Mac, and most of my files (mostly photos) doesn't show up on external HDD when I plug it into the Mac, and I can't figure out why. All of those files are there when plugged into the PC. For example, on Mac I can only see the folders, and when I open them, there are no files inside, or even in some cases, half of the photos show up and half doesn't (they all have the same extension btw). Please help if you can. Thank you.
MacBook Air 13″, macOS 11.1