InDesign won't export single pages to spreads as a PDF
I have created an InDesign booklet consisting of 20 single pages but would like to export it as spreads, I select Spreads in the PDF export option but when it then opens the exported PDF it is still single pages, am I missing an option to tick on or off, or could it be a bug, I just cant seem to get it to export the PDF as Spreads? (I do get some funny things happening in my 'Range' option box that looks a little funky but I'm not sure that that has anything to do with my issue). 
