I lost data from my WD external drive

Hi,

I really need some help. I have a WD My Passport 1TB external hard drive. I was using it normally, and suddenly I noticed that some of my folders and files are missing. I didn’t delete anything. I just unplugged it and plugged it back in later, and that’s when I saw the issue.
I tried checking for hidden files, and ran a scan using Windows error checking, but nothing changed. I haven’t saved or moved anything new to the drive after this happened.
Not sure what else to do. Has anyone had this happen before? Any idea how to get the files back?

Thanks