I have Lightroom 5 and software is up to date. I can create a collection by selecting photos initially but after that I can't select photos and drag to a collection. Not sure what I am doing wrong as I have searched a number of tutorials and help sites.I am trying to do this in the library module, grid.
Make sure you are doing the click-drag on the thumbnail and not the gray frame.
Thanks for the quick and correct reply. It was so obvious I missed it. Problem solved.