I installed nextgen gallery then uploaded images under '/wp-content/gallery/my_gallery/' directory. I decided to add watermarks on all gallery images.
I uploaded the PNG logo under '/wp-content/gallery/logo.png'. Updated the watermark URL and save the changes. It displayed in the preview section but when I visit the front end it doesn't. Is the problem related to server issues? By the way, I'm using WP version 8.4 and memory limit on our server is 128M .
Please help me guys because I really need to fix this issue. Thanks in advance.