We’ve added some improvements on this for the next build (5.2.3):
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the gal tag now handles sub folders properly
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added a third tag (values “yes” or “no”, default “no” ) for showing all of the images in a folder or not. (The images are still added to the HTML since “baguette box” - lightbox framework - seems to need them. They are just invisible otherwise.)
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The last thing is to check the Redactor image plugin to see how it handles images in subfolders