I still can't get the galley to work. I tried both firefox and chomium (chrome for linux), but both shows no files after pressing 'submit' despite claiming that there are multiple files. This applies both if there is being uploaded one or two files.
Don't know if a mod sees this, but don't really know where to put it...
You don't have to upload a photo to the gallery in order to use it in a post. You can upload an image directly to the post itself and there are at least two threads here that explain exactly how to do this.