Taking in-game photos


So for the last few days i have been busy looking around and trying things out but I still cannot see any way I can make a system for taking,storing and then looking at in-game photos. I have had some limited success using the scenecapture2D and rendertarget2D , but I cannot find a way I can store the photo information either inside a texture or as a png/jpg. I saw there was an unreal plugin that allowed me to save the photos but is there any way I can do it without? Just some tips or pointing me in the right direction will be greatly appreciated.