Ubuntu latest version 21.04
Apache2
PHP 7.4
Thumbs are ok loaded, folder structure as well
content is folder is a mounted CIFS share from NAS
Log does not show issues for apache
/content/Diversen/3FM/DSC00988.jpg HTTP/1.1" 200
it gives an 200
99% of all images do fail only a very very few are loaded and displayed, sometimes a image is loaded but direclty the messge The Image could not be loaded
thumbs are loaded ok