I'd try all the solutions propose before but none of them work for me. Now only able to view medium size, small and original not able to display at all. Thank for the help

upload directory path is file://///xx.xx.xx.xx/
Uploads directory server path is uploads/

Medium-sized thumbs are generated using the server path whereas the other two use the internet path, so make sure

file://///xx.xx.xx.xx/

is right. Try changing it to

file://///xx.xx.xx.xx/zenith/gallery/uploads/

or whatever the path to your uploads directory is and try again.

Hi Usr.c,

I'd replace the file://///xx.xx.xx.xx/ to http://xx.xx.xx.xx/zenith/uploads/ and it work fine now. Thank for the help.