The Local Image Loader can browse folders visually, but only output a
picked image. Add a third output, folder: the path of the folder the
gallery shows, or the picked image's folder until the user browses.
Browsing is enough, so a training dataset can be found by its thumbnails
and passed to a node that reads a whole folder.
The gallery stores the shown folder through set_node_selection (type
"folder"), which accepts only directories inside the allowed roots;
load_media checks the stored folder against the roots again.
Vito Sansevero