Plugin is loading full images and resize them

Hi,

I’m looking for ages and via this article, I bumped into your plugin.
https://novo-media.ch/en/wordpress-site/best-wordpress-gallery-plugin/?fbclid=IwAR3A-ZXAcbXsu0Yti9nrvGwKGqreVULAtH2ym596twwMP5SKHRJDvdyXPOY

1. Your plugin uses the native WordPress lib and gall. (good for future incase we change or whatever) So that’s a thumb up!

2. I’m a photographer and I want to publish my photos on my website.
Inside a post, with an overview of all the small images (thumbnails) Fixed sizes.

I only see that your square has a fixed size.

Now my problem is the following, I have a plugin that watermarks the LARGE image size. (to keep the full image untouched)

But in your plugin settings, I can’t select that it opens the large image instead of the full image.

So for now I changed the watermark system to watermark the full image only and leave all other created image sizes from the full image untouched.

CREATING A POST WITH GALLERY
When I create/upload photos to the media folder and add them to the post. ‘the small image sizes (for example tiles), also show already the watermark. Meaning that the full-size photos are used and resized. And that the other formats that my theme makes are not used.

Because I don’t want the watermark is visible and to save bandwidth as I made different image sizes for all screen sizes all ready to be used in such a case. So that the watermark image is only visible in the lightbox.

3.
Also I’m missing an option to have the small images in your gallery (before the large image in the lightbox) a fixed size that I wish to use. Is this correct?

I hope you understand this a bit.