Hi Aesqe,
Sorry but it sounds like I don’t understand fully how to use this plugin and was, perhaps, only getting lucky with the great result I got for a couple of years using it. I don’t even use any short code that I am aware of. At least I never manually inserted any short code in the post as some gallery plugins require. I simply went to the post and File Gallery would show all of the available images below the post. I would either select “Insert Gallery” or I would select a number of images by “cont + click” and then select “Insert Single Files”. That would be it. The plugin would insert the images into the post automatically without me adding any short code. When I would update the post it would show perfectly on the blog with all of the thumbnails evenly sized at about 1″ wide by 3/4″ high. I have “jQuery Lightbox For Native Galleries” installed and when I would click on any of the thumbnails they would show in a lightbox, one at a time, in their various original sizes as a full size image.
I have searched the Internet, including YouTube, for a File Gallery tutorial but, surprisingly, I haven’t been able to find any. There are scads of tutorials for lesser quality image gallery plugins out there but I can’t find any for this excellent plugin.
Thanks