Watermark on Photos and Thumbnails in the CB Gallery doesn't work

I have a watermark .PNG file, that I use with some PHP code, that I include on all Images with the help of a little .HTACCESS file in each directory where are those Images (and sub-folders also).
It works every where but not for the Images in CB Gallery folder.
How do I make it work, so watermark would be on each Phooto and Thumbnail of CB Gallery?

There is no watermark feature in CB Gallery. It's planned in a later release. It has to be added through our image processing API for it to be processed into the image.