Can anyone help?

I need a document that will allow me to insert a folders worth of pictures at once (could vary from 10 photos to 500/1000) automatically (the photos all need to be the same size when inserted). I'm looking at four pictures to a page (2 columns of 2) with a slight space between. Ideally, I need a caption box underneath each picture automatically numbering (Photograph No 1, Photograph No 2 etc.) where I can then type descriptions for each photo. I currently have a macro that does exactly this but only 2 photos to a page. Any ideas would be very much appreciated. (Running on Office 365)