Thank you for uploading the images @Francois_Douville 
The problem here is still the same.
It’s a combination the size of the images you’re using and your Discourse settings.
If an image is not big enough (height and/or width) to exceed the default settings in your Discourse install, no lightbox view will be created for it.
The default settings look like this:
What this means is - unless you change the default settings
If an image has a width that exceeds 690px, a lightbox view will be created for it.
and…
If an image has a height of 500px or more, a lightbox will be created for it.
Images smaller than that will not have any lightbox views created for them.
Tiles and Slick only work for images that have lightboxes (read: large images)
So you have two options to make this work.
-
Decrease the height / width settings in your Discourse install, so that smaller images also get lightboxes
-
Or use larger images