Hey @ars 
Right now you have two options:
- Upload the images as normal then convert them to
<img>tags in the editor and create a HTML section in the markdown that has the structure that Galleria expects - Do everything client-side. You might be able to wrap the group of markdown images in a
<div class="galleria">wrapper (be sure to leave a blank line before/after any HTML) so that they are more easily targetable
In the future it will be possible to use a “gallery card” in the new Koenig editor to do this sort of thing much more easily.