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My site:
https://www.jefwodniack.com
samle uge it port folio : https://www.jefwodniack.com/wordpress/japon-tradition/

Dear user if we didn’t turn off image optimization function, then portfolio takes thumbnails and not full images.
Please contact [email protected] and provide us with your page link

I see. You use Lightbox view. This view takes natural size of the image.
If you need it took only thumbnails try to use Thumbnails view

How can I Use Thumbnails view this choice doesn’t appear in the list box in portfolio ?
portfolio exemple: https://www.jefwodniack.com/wordpress/panoramiques/

All right. So If you don’t need additional images, then I will suggest you take a look at this plugin, https://www.ads-software.com/support/view/plugin-reviews/gallery-images
I send you the demo of Thumbnails view https://huge-it.com/wordpress-gallery-demo-5-thumbnails/