Adding Extras to DVD

I have made a wedding DVD for my neice that works just fine. There is quite a bit of room left so now I want to add a folder and put her wedding photos in it. In the past I have burned DVDs by just copying the VIDEO_TS folder to a DVD. This time I added a folder called "photographs", but the results won't play in either of my DVD players. Is there a reason why this won't work? Should I be using a different program?
 
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