I have many pictures on my site and after posting for a while, I realized that I should have watermarked them. So I did just that, I downloaded all the images and watermarked them. I uploaded a few of them back up to the site using FTP and replacing the images in the wp-content folder and I cleared my cache but the images dont show the updated version with the watermark. Is there no way to edit the image? Do I have to manually re-add the images to WP using the upload button on the page?
Thanks for any help.