SMB shared video files from Windows to Linux
Found the problem! It has to do with SELinux. After looking at the folder with

ls -Z


And seeing that files that were accessible had a context that the folder didn't (httpd_sys_rw_content_t), I disabled SELinux with

sudo setenforce 0


and I was able to access the files. Of course, I have more work to do, and I don't intend on keeping it turned off, but this at least shows me where the problem is. Wu!