Thank you very much flydev!
It is my fault. What I mean is, I want to replace images in a a gallery by front end editing.
The problem is, the default method (double-click) does not work, because a single click provokes the modal for the gallery view.
The gallery can be found here: http://sachinchoolur.github.io/lightGallery/
My question is do I have a chance in replacing the images by front end editing, and by which method?
Or is the user forced to use the backend?
Thanks again for supporting me : )
David